Certain chemical entities, compositions, and methods

ABSTRACT

Chemical entities that modulate smooth muscle myosin and/or non-muscle myosin, and chemical entities, pharmaceutical compositions and methods of treatment of diseases and conditions associated with smooth muscle myosin and/or non-muscle myosin are described.

This application claims the benefit of U.S. Provisional PatentApplication No. 60/835,236, filed Aug. 2, 2006, which is incorporatedherein by reference for all purposes.

Provided are certain substituted heterocycles, including chemicalentities that modulate smooth muscle myosin and/or non-muscle myosin,and chemical entities, pharmaceutical compositions and methods oftreatment of diseases and conditions associated with smooth musclemyosin and/or non-muscle myosin.

Myosin is present in all muscle and non-muscle cells. Of the tendistinct classes of myosin in human cells, myosin-II is thought to bethe form responsible for contraction of skeletal, cardiac, and smoothmuscle. Myosin-II is also the isoform present in non-muscle myosins,also known as cytoplasmic myosins. The non-muscle myosins areubiquitously present in eukaryotic cells, where the smooth musclemyosins are generally present in smooth muscle cells.

Myosin-II is significantly different in amino acid composition and inoverall structure from myosins in the other nine distinct classes.Myosin-II consists of two globular head domains, called Subfragment-1 orS1, linked together by a long alpha-helical coiled-coiled tail.Proteolysis of myosin generates either S1 or heavy meromyosin (HMM, atwo-headed form with a truncated tail), depending on the proteolysisconditions. S1 contains the ATPase and actin-binding properties of themolecule. S1 has been shown to be sufficient to move actin filaments invitro, and is therefore likely to be the motor domain of the molecule.

Although myosin-II isoforms from various tissues differ in a number ofbiological properties, they share the same basic molecular structure asa dimer of two heavy chains (approximately 200 kDa) which arenoncovalently associated with two pairs of light chains (approximately20 and 17 kDa). The two globular amino-terminal heads are tetheredtogether by the carboxy-terminal alpha-helical coiled-coil that forms atail. The tails are believed to be involved in the assembly of myosinmolecules into filaments, whereas the heads are thought to have anactin-activated Mg²⁺-ATPase activity. Each myosin head can be divided bythree protease-sensitive regions into peptides of approximately 25, 50,and 20 kDa. The more amino-terminal 25 kDa-50 kDa junction is close tothe ATP binding region, whereas the actin-binding domain is near the 50kDa-20 kDa junction.

S1 consists of a globular actin binding and nucleotide binding regionknown as the catalytic domain. This domain is attached at itscarboxy-terminus to an alpha-helix that has two light chains of about 20kDa each wrapped around it. This light-chain binding domain of S1 isknown as the lever arm. Upon transitioning from the pre-stroke to thepost-stroke state, the lever arm is believed to swing through an angleof about 90 degrees about a fulcrum point in the catalytic domain nearthe nucleotide-binding site. The “power stroke” is driven by thehydrolysis of ATP.

The other end of the myosin molecule is an alpha-helical coiled-coiledtail involved in self assembly of myosin molecules into bipolar thickfilaments. These thick filaments interdigitate between thinner actinfilaments, and the two filament systems slide past one another duringcontraction of the muscle. This filament sliding mechanism is thought toinvolve conformational changes in the myosin heads causing them to walkalong the thin actin filaments at the expense of ATP hydrolysis. Whilenon-muscle myosins act in a similar manner, they are understood to slideat a slower velocity than the smooth muscle myosins.

The complete cDNA of the human smooth muscle myosin has been described.The sequence of human smooth muscle myosin is 52% identical to humancardiac myosin in the catalytic S1 region. See, for example, PCTpublication No. WO 03/14323.

Provided is at least one chemical entity chosen from compounds ofFormula I:

-   -   and pharmaceutically acceptable salts thereof wherein    -   R¹ and R⁴ are independently chosen from hydrogen, cyano, halo,        hydroxy, azido, nitro, sulfonyl, sulfinyl, sulfanyl, optionally        substituted alkoxy, optionally substituted acyloxy, optionally        substituted aminocarbonyloxy, optionally substituted aryloxy,        optionally substituted heteroaryloxy, optionally substituted        heterocycloalkyloxy, optionally substituted alkoxycarbonyl,        optionally substituted alkyl, optionally substituted alkenyl,        optionally substituted alkynyl, optionally substituted aryloxy,        optionally substituted aryl, optionally substituted heteroaryl,        optionally substituted heterocycloalkyl, optionally substituted        amino, optionally substituted acyl, optionally substituted        aminocarbonyl, and optionally substituted carbaminodoyl;    -   Z¹ is chosen from hydrogen, cyano, optionally substituted alkyl,        optionally substituted acyl, optionally substituted        alkoxycarbonyl, optionally substituted amino, optionally        substituted aminocarbonyl, optionally substituted carbamimidoyl,        optionally substituted alkoxy, optionally substituted aryloxy,        optionally substituted heteroaryloxy, optionally substituted        heterocycloalkyloxy, optionally substituted alkenyl, optionally        substituted alkynyl, sulfonyl, sulfinyl, and sulfanyl;    -   Z² is chosen from hydrogen, optionally substituted amidino,        carboxyl, optionally substituted alkoxycarbonyl, optionally        substituted acyl, optionally substituted alkenyl, optionally        substituted alkyl, optionally substituted heterocycloalkyl,        optionally substituted heteroaryl, and optionally substituted        aminocarbonyl;    -   Z³ is chosen from optionally substituted alkyl; and    -   R³ is chosen from hydrogen and optionally substituted alkyl.

Also provided is a pharmaceutical composition comprising at least onechemical entity described herein, together with at least onepharmaceutically acceptable vehicle chosen from carriers, adjuvants, andexcipients.

Also provided are methods of treatment of one or more diseasesassociated with smooth muscle myosin, or non-muscle myosin. The methodsof treatment comprise administering a therapeutically effective amountof at least one chemical entity provided herein or a pharmaceuticalcomposition comprising at least one chemical entity described herein,together with at least one pharmaceutically acceptable vehicle chosenfrom carriers, adjuvants, and excipients.

Other aspects and embodiments will be apparent to those skilled in theart from the following detailed description.

As used in the present specification, the following words and phrasesare generally intended to have the meanings as set forth below, exceptto the extent that the context in which they are used indicatesotherwise.

The following abbreviations and terms have the indicated meaningsthroughout:

-   PIPES=1,4-piperazinediethanesulfonic acid-   ATP=adenosine 5′-triphosphate-   DTT=DL-dithiothreitol-   BSA=bovine serum albumin-   NADH=nicotinamide adenine dinucleotide-   PEP=phosphoenolpyruvic acid-   EGTA=ethylene glycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetic    acid-   Ac=acetyl-   APCI=atmospheric pressure chemical ionization-   atm=atomosphere-   Boc=tert-butoxycarbonyl-   c-=cyclo-   CBZ=carbobenzyloxy=benzyloxycarbonyl-   CDI=carbonyldiimidazole-   DCM=dichloromethane=methylene chloride=CH₂Cl₂-   DIAD=diisopropyl azodicarboxylate-   DIEA=DIPEA=N,N-diisopropylethylamine-   DMAP=4-(dimethylamino)pyridine-   DMF=N,N-dimethylformamide-   DMSO=dimethyl sulfoxide-   (DPPF)PdCl₂=[1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II)-   Et=ethyl-   EtOAc=ethyl acetate-   EtOH=ethanol-   g=gram-   GC=gas chromatography-   h or hr=hour-   HATU=O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium    hexafluorophosphate-   HBTU=O-(benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium    hexafluorophosphate-   HOBT=1-hydroxybenzotriazole-   HPLC=high pressure liquid chromatography-   i-=iso-   kg or Kg=kilogram-   L or I=liter-   LC/MS=LCMS=liquid chromatography-mass spectrometry-   LDA=lithium diisopropylamide-   LRMS=low resolution mass spectrometry-   m/z=mass-to-charge ratio-   Me=methyl-   NMP=N-Methyl-2-pyrrolidone-   NMR=nuclear magnetic resonance-   MPLC=medium pressure liquid chromatography-   min=minute-   mL=milliliter-   MW=microwave-   n-=normal-   Ph=phenyl-   (Ph₃P)₄Pd=tetrakis(triphenylphosphine)palladium(0)-   (Ph₃P)₂PdCl₂=dichlorobis(triphenylphosphine)palladium(II)-   RP-HPLC=reverse phase-high pressure liquid chromatography-   rt or RT=room temperature-   s-=sec-=secondary-   t-=tert-=tertiary-   TBAF=tetrabutylammonium fluoride-   TBS=TBDMS=tert-butyldimethylsilyl-   TES=triethylsilyl or triethylsilane-   TMS=trimethylsilyl or trimethylsilane-   TFA=trifluoroacetic acid-   THF=tetrahydrofuran-   TLC=thin layer chromatography-   UV=ultraviolet-   Vol=volume equivalent in mL/g or L/Kg or the limiting reagent unless    otherwise specified

As used herein, when any variable occurs more than one time in achemical formula, its definition on each occurrence is independent ofits definition at every other occurrence.

A dash (“-”) that is not between two letters or symbols is used toindicate a point of attachment for a substituent. For example, —CONH₂ isattached through the carbon atom.

By “optional” or “optionally” is meant that the subsequently describedevent or circumstance may or may not occur, and that the descriptionincludes instances where the event or circumstance occurs and instancesin which it does not. For example, “optionally substituted alkyl”encompasses both “alkyl” and “substituted alkyl” as defined below. Itwill be understood by those skilled in the art, with respect to anygroup containing one or more substituents, that such groups are notintended to introduce any substitution or substitution patterns that aresterically impractical, synthetically non-feasible and/or inherentlyunstable.

The term “ATPase,” as used herein, refers to an enzyme that is capableof hydrolyzing ATP. ATPases include proteins comprising molecular motorssuch as myosins.

“Alkyl” encompasses straight chain and branched chain having theindicated number of carbon atoms, usually from 1 to 20 carbon atoms, forexample 1 to 8 carbon atoms, such as 1 to 6 carbon atoms. For exampleC₁-C₆ alkyl encompasses both straight and branched chain alkyl of from 1to 6 carbon atoms. Examples of alkyl groups include methyl, ethyl,propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, pentyl, 2-pentyl,isopentyl, neopentyl, hexyl, 2-hexyl, 3-hexyl, 3-methylpentyl, and thelike. Alkylene is another subset of alkyl, referring to the sameresidues as alkyl, but having two points of attachment. Alkylene groupswill usually have from 2 to 20 carbon atoms, for example 2 to 8 carbonatoms, such as from 2 to 6 carbon atoms. For example, C₀ alkyleneindicates a covalent bond and C₁ alkylene is a methylene group. When analkyl residue having a specific number of carbons is named, allgeometric combinations having that number of carbons are intended to beencompassed; thus, for example, “butyl” is meant to include n-butyl,sec-butyl, isobutyl and t-butyl; “propyl” includes n-propyl andisopropyl. “Lower alkyl” refers to alkyl groups havirig one to fourcarbons.

“Alkenyl” refers to an unsaturated branched or straight-chain alkylgroup having at least one carbon-carbon double bond derived by theremoval of one hydrogen atom from a single carbon atom of a parentalkene. The group may be in either the cis or trans configuration aboutthe double bond(s). Typical alkenyl groups include, but are not limitedto, ethenyl; propenyls such as prop-1-en-1-yl, prop-1-en-2-yl,prop-2-en-1-yl (allyl), prop-2-en-2-yl, cycloprop-1-en-1-yl;cycloprop-2-en-1-yl; butenyls such as but-1-en-1-yl, but-1-en-2-yl,2-methyl-prop-1-en-1-yl, but-2-en-1-yl, but-2-en-1-yl, but-2-en-2-yl,buta-1,3-dien-1-yl, buta-1,3-dien-2-yl, cyclobut-1-en-1-yl,cyclobut-1-en-3-yl, cyclobuta-1,3-dien-1-yl; and the like. In certainembodiments, an alkenyl group has from 2 to 20 carbon atoms and in otherembodiments, from 2 to 6 carbon atoms.

“Alkynyl” refers to an unsaturated branched or straight-chain alkylgroup having at least one carbon-carbon triple bond derived by theremoval of one hydrogen atom from a single carbon atom of a parentalkyne. Typical alkynyl groups include, but are not limited to, ethynyl;propynyls such as prop-1-yn-1-yl, prop-2-yn-1-yl; butynyls such asbut-1-yn-1-yl, but-1-yn-3-yl, but-3-yn-1-yl; and the like. In certainembodiments, an alkynyl group has from 2 to 20 carbon atoms and in otherembodiments, from 3 to 6 carbon atoms.

“Cycloalkyl” indicates a non-aromatic carbocyclic ring, usually havingfrom 3 to 7 ring carbon atoms. The ring may be saturated or have one ormore carbon-carbon double bonds. Examples of cycloalkyl groups includecyclopropyl, cyclobutyl, cyclopentyl, cyclopentenyl, cyclohexyl, andcyclohexenyl, as well as bridged and caged saturated ring groups such asnorbornane.

By “alkoxy” is meant an alkyl group of the indicated number of carbonatoms attached through an oxygen bridge such as, for example, methoxy,ethoxy, propoxy, isopropoxy, n-butoxy, sec-butoxy, tert-butoxy,pentyloxy, 2-pentyloxy, isopentyloxy, neopentyloxy, hexyloxy,2-hexyloxy, 3-hexyloxy, 3-methylpentyloxy, and the like. Alkoxy groupswill usually have from 1 to 7 carbon atoms attached through the oxygenbridge. “Lower alkoxy” refers to alkoxy groups having one to fourcarbons.

The term “amidino” refers to the group —C(═NH)—NH₂. The term“substituted amidino” refers to the formula —C(═NR′)—NR″R″ in which eachof the R″ groups is independently chosen from hydrogen, optionallysubstituted alkyl, optionally substituted alkoxy, optionally substitutedaminocarbonyl, optionally substituted aryl, optionally substitutedheteroaryl, optionally substituted heterocyclyl, acyl, alkoxycarbonyl,sulfanyl, sulfinyl and sulfonyl and R′ is chosen from hydrogen, cyano,optionally substituted alkyl, optionally substituted alkoxy, optionallysubstituted aminocarbonyl, optionally substituted aryl, optionallysubstituted heteroaryl, optionally substituted heterocyclyl, acyl,alkoxycarbonyl, sulfanyl, sulfinyl and sulfonyl, provided that at leastone R′ or R″ group is not hydrogen.

“Mono- and di-alkylcarboxamide” encompasses a group of the formula—(C═O)NR_(a)R_(b) where R_(a) and R_(b) are independently chosen fromhydrogen and alkyl groups of the indicated number of carbon atoms,provided that R_(a) and R_(b) are not both hydrogen.

“Acyl” refers to the groups H—C(O)—; (alkyl)-C(O)—; (cycloalkyl)-C(O)—;(aryl)-C(O)—; (heteroaryl)-C(O)—; and (heterocycloalkyl)-C(O)—, whereinthe group is attached to the parent structure through the carbonylfunctionality and wherein alkyl, cycloalkyl, aryl, heteroaryl, andheterocycloalkyl are as described herein. Acyl groups have the indicatednumber of carbon atoms, with the carbon of the keto group being includedin the numbered carbon atoms. For example a C₂ acyl group is an acetylgroup having the formula CH₃(C═O)—.

“Formyl” refers to the group —C(O)H.

“Carboxy” and/or “carboxyl” refer to the group —C(O)OH.

By “alkoxycarbonyl” is meant a group of the formula (alkoxy)(C═O)—attached through the carbonyl carbon wherein the alkoxy group has theindicated number of carbon atoms. Thus a C₁-C₆ alkoxycarbonyl group isan alkoxy group having from 1 to 6 carbon atoms attached through itsoxygen to a carbonyl linker.

By “amino” is meant the group —NH₂.

“Mono- and di-(alkyl)amino” encompasses secondary and tertiary alkylamino groups, wherein the alkyl groups are as defined above and have theindicated number of carbon atoms. The point of attachment of thealkylamino group is on the nitrogen. Examples of mono- and di-alkylaminogroups include ethylamino, dimethylamino, and methyl-propyl-amino.

The term “optionally substituted aminocarbonyl” refers to the group—CONR^(b)R^(c), where R^(b) is chosen from H, optionally substitutedC₁-C₆ alkyl, optionally substituted cycloalkyl, optionally substitutedheterocycloalkyl, optionally substituted aryl, and optionallysubstituted heteroaryl; and

-   -   R^(c) is independently chosen from hydrogen and optionally        substituted C₁-C₄ alkyl; or    -   R^(b) and R^(c) taken together with the nitrogen to which they        are bound, form an optionally substituted 5- to 7-membered        nitrogen-containing heterocycloalkyl which optionally includes 1        or 2 additional heteroatoms selected from O, N, and S in the        heterocycloalkyl ring;    -   where each substituted group is independently substituted with        one or more substituents independently selected from C₁-C₄        alkyl, aryl, heteroaryl, aryl-C₁-C₄ alkyl-, heteroaryl-C₁-C₄        alkyl-, C₁-C₄ haloalkyl, —OC₁-C₄ alkyl, —OC₁-C₄ alkylphenyl,        —C₁-C₄ alkyl-OH, —OC₁-C₄ haloalkyl, halo, —OH, —NH₂, —C₁-C₄        alkyl-NH₂, —N(C₁-C₄ alkyl)(C₁-C₄ alkyl), —NH(C₁-C₄ alkyl),        —N(C₁-C₄ alkyl)(C₁-C₄ alkylphenyl), —NH(C₁-C₄ alkylphenyl),        cyano, nitro, oxo (as a substitutent for cycloalkyl,        heterocycloalkyl, or heteroaryl), —CO₂H, —C(O)OC₁-C₄ alkyl,        —CON(C₁-C₄ alkyl)(C₁-C₄ alkyl), —CONH(C₁-C₄ alkyl), —CONH₂,        —NHC(O)(C₁-C₄ alkyl), —NHC(O)(phenyl), —N(C₁-C₄ alkyl)C(O)(C₁-C₄        alkyl), —N(C₁-C₄ alkyl)C(O)(phenyl), —C(O)C₁-C₄ alkyl,        —C(O)C₁-C₄ alkylphenyl, —C(O)C₁-C₄ haloalkyl, —OC(O)C₁-C₄ alkyl,        —SO₂(C₁-C₄ alkyl), —SO₂(phenyl), —SO₂(C₁-C₄ haloalkyl), —SO₂NH₂,        —SO₂NH(C₁-C₄ alkyl), —SO₂NH(phenyl), —NHSO₂(C₁-C₄ alkyl),        —NHSO₂(phenyl), and —NHSO₂(C₁-C₄ haloalkyl).

“Aryl” encompasses:

-   -   6-membered carbocyclic aromatic rings, for example, benzene;    -   bicyclic ring systems wherein at least one ring is carbocyclic        and aromatic, for example, naphthalene, indane, and tetralin;        and    -   tricyclic ring systems wherein at least one ring is carbocyclic        and aromatic, for example, fluorene.

For example, aryl includes 6-membered carbocyclic aromatic rings fusedto a 5- to 7-membered heterocycloalkyl ring containing 1 or moreheteroatoms chosen from N, O, and S. For such fused, bicyclic ringsystems wherein only one of the rings is a carbocyclic aromatic ring,the point of attachment may be at the carbocyclic aromatic ring or theheterocycloalkyl ring. Bivalent radicals formed from substituted benzenederivatives and having the free valences at ring atoms are named assubstituted phenylene radicals. Bivalent radicals derived from univalentpolycyclic hydrocarbon radicals whose names end in “-yl” by removal ofone hydrogen atom from the carbon atom with the free valence are namedby adding “-idene” to the name of the corresponding univalent radical,e.g., a naphthyl group with two points of attachment is termednaphthylidene. Aryl, however, does not encompass or overlap in any waywith heteroaryl, separately defined below. Hence, if one or morecarbocyclic aromatic rings is fused with a heterocycloalkyl aromaticring, the resulting ring system is heteroaryl, not aryl, as definedherein.

The term “aryloxy” refers to the group —O-aryl.

The term “aralkyl” refers to the group -alkyl-aryl.

“Carbamimidoyl” refers to the group —C(═NH)—NH₂.

“Substituted carbamimidoyl” refers to the group —C(═NR^(e))—NR^(f)R^(g)where R^(e) is chosen from: hydrogen, cyano, optionally substitutedalkyl, optionally substituted cycloalkyl, optionally substituted aryl,optionally substituted heteroaryl, and optionally substitutedheterocycloalkyl; and R^(f) and R^(g) are independently chosen from:hydrogen optionally substituted alkyl, optionally substitutedcycloalkyl, optionally substituted aryl, optionally substitutedheteroaryl, and optionally substituted heterocycloalkyl, provided thatat least one of R^(e), R^(f), and R^(g) is not hydrogen and whereinsubstituted alkyl, cycloalkyl, aryl, heterocycloalkyl, and heteroarylrefer respectively to alkyl, cycloalkyl, aryl, heterocycloalkyl, andheteroaryl wherein one or more (such as up to 5, for example, up to 3)hydrogen atoms are replaced by a substituent independently chosen from:

—R^(a), —OR^(b), optionally substituted amino (including —NR^(c)COR^(b),—NR^(c)CO₂R^(a), —NR^(c)CONR^(b)R^(c), —NR^(b)C(NR^(c))NR^(b)R^(c), —NRBC(NCN)NR^(b)R^(c), and —NR^(c)SO₂R^(a)), halo, cyano, nitro, oxo (as asubstitutent for cycloalkyl, heterocycloalkyl, and heteroaryl),optionally substituted acyl (such as —COR^(b)), optionally substitutedalkoxycarbonyl (such as —CO₂R^(b)), optionally substituted aminocarbonyl(such as —CONR^(b)R^(c)), —OCOR^(b), —OCO₂R^(a), —OCONR^(b)R^(c),—OP(O)(OR^(b))OR^(c), sulfanyl (such as SR^(b)), sulfinyl (such as—SOR^(a)), and sulfonyl (such as —SO₂R^(a) and —SO₂NR^(b)R^(c)),

where R^(a) is chosen from optionally substituted C₁-C₆ alkyl,optionally substituted aryl, and optionally substituted heteroaryl;

R^(b) is chosen from H, optionally substituted C₁-C₆ alkyl, optionallysubstituted aryl, and optionally substituted heteroaryl; and

R^(c) is independently chosen from hydrogen and optionally substitutedC₁-C₄ alkyl; or

R^(b) and R^(c), and the nitrogen to which they are attached, form anoptionally substituted heterocycloalkyl group; and

where each optionally substituted group is unsubstituted orindependently substituted with one or more, such as one, two, or three,substituents independently selected from C₁-C₄ alkyl, aryl, heteroaryl,aryl-C₁-C₄ alkyl-, heteroaryl-C₁-C₄ alkyl-, C₁-C₄ haloalkyl, —OC₁-C₄alkyl, —OC₁-C₄ alkylphenyl, —C₁-C₄ alkyl-OH, —OC₁-C₄ haloalkyl, halo,—OH, —NH₂, —C₁-C₄ alkyl-NH₂, —N(C₁-C₄ alkyl)(C₁-C₄ alkyl), —NH(C₁-C₄alkyl), —N(C₁-C₄ alkyl)(C₁-C₄ alkylphenyl), —NH(C₁-C₄ alkylphenyl),cyano, nitro, oxo (as a substitutent for cycloalkyl, heterocycloalkyl,or heteroaryl), —CO₂H, —C(O)OC₁-C₄ alkyl, —CON(C₁-C₄ alkyl)(C₁-C₄alkyl), —CONH(C₁-C₄ alkyl), —CONH₂, —NHC(O)(C₁-C₄ alkyl),—NHC(O)(phenyl), —N(C₁-C₄ alkyl)C(O)(C₁-C₄ alkyl), —N(C₁-C₄alkyl)C(O)(phenyl), —C(O)C₁-C₄ alkyl, —C(O)C₁-C₄ phenyl, —C(O)C₁-C₄haloalkyl, —OC(O)C₁-C₄ alkyl, —SO2(C₁-C₄ alkyl), —SO₂(phenyl),—SO₂(C₁-C₄ haloalkyl), —SO₂NH₂, —SO₂NH(C₁-C₄ alkyl), —SO₂ NH(phenyl),—NHSO₂(C₁-C₄ alkyl), —NHSO₂(phenyl), and —NHSO₂(C₁-C₄ haloalkyl).

The term “halo” includes fluoro, chloro, bromo, and iodo, and the term“halogen” includes fluorine, chlorine, bromine, and iodine.

“Haloalkyl” indicates alkyl as defined above having the specified numberof carbon atoms, substituted with 1 or more halogen atoms, up to themaximum allowable number of halogen atoms. Examples of haloalkylinclude, but are not limited to, trifluoromethyl, difluoromethyl,2-fluoroethyl, and penta-fluoroethyl.

“Heteroaryl” encompasses:

-   -   5- to 7-membered aromatic, monocyclic rings containing one or        more, for example, from 1 to 4, or in certain embodiments, from        1 to 3, heteroatoms chosen from N, O, and S, with the remaining        ring atoms being carbon;    -   bicyclic heterocycloalkyl rings containing one or more, for        example, from 1 to 4, or in certain embodiments, from 1 to 3,        heteroatoms chosen from N, O, and S, with the remaining ring        atoms being carbon and wherein at least one heteroatom is        present in an aromatic ring; and    -   tricyclic heterocycloalkyl rings containing one or more, for        example, from 1 to 5, or in certain embodiments, from 1 to 4,        heteroatoms chosen from N, O, and S, with the remaining ring        atoms being carbon and wherein at least one heteroatom is        present in an aromatic ring.

For example, heteroaryl includes a 5- to 7-membered heterocycloalkyl,aromatic ring fused to a 5- to 7-membered cycloalkyl or heterocycloalkylring. For such fused, bicyclic heteroaryl ring systems wherein only oneof the rings contains one or more heteroatoms, the point of attachmentmay be at either ring. When the total number of S and O atoms in theheteroaryl group exceeds 1, those heteroatoms are not adjacent to oneanother. In certain embodiments, the total number of S and O atoms inthe heteroaryl group is not more than 2. In certain embodiments, thetotal number of S and O atoms in the aromatic heterocycle is not morethan 1. Examples of heteroaryl groups include, but are not limited to,(as numbered from the linkage position assigned priority 1), 2-pyridyl,3-pyridyl, 4-pyridyl, 2,3-pyrazinyl, 3,4-pyrazinyl, 2,4-pyrimidinyl,3,5-pyrimidinyl, 2,3-pyrazolinyl, 2,4-imidazolinyl, isoxazolinyl,oxazolinyl, thiazolinyl, thiadiazolinyl, tetrazolyl, thienyl,benzothiophenyl, furanyl, benzofuranyl, benzoimidazolinyl, indolinyl,pyridazinyl, triazolyl, quinolinyl, pyrazolyl, and5,6,7,8-tetrahydroisoquinolinyl. Bivalent radicals derived fromunivalent heteroaryl radicals whose names end in “-yl” by removal of onehydrogen atom from the atom with the free valence are named by adding“-idene” to the name of the corresponding univalent radical, e.g., apyridyl group with two points of attachment is a pyridylidene.Heteroaryl does not encompass or overlap with aryl, cycloalkyl, orheterocycloalkyl, as defined herein

Substituted heteroaryl also includes ring systems substituted with oneor more oxide (—O⁻) substituents, such as pyridinyl N-oxides.

By “heterocycloalkyl” is meant a single, non-aromatic ring, usually with3 to 7 ring atoms, containing at least 2 carbon atoms in addition to 1-3heteroatoms independently selected from oxygen, sulfur, and nitrogen, aswell as combinations comprising at least one of the foregoingheteroatoms. The ring may be saturated or have one or more carbon-carbondouble bonds. Suitable heterocycloalkyl groups include, for example (asnumbered from the linkage position assigned priority 1), 2-pyrrolidinyl,2,4-imidazolidinyl, 2,3-pyrazolidinyl, 2-piperidyl, 3-piperidyl,4-piperidyl, and 2,5-piperizinyl. Morpholinyl groups are alsocontemplated, including 2-morpholinyl and 3-morpholinyl (numberedwherein the oxygen is assigned priority 1). Substituted heterocycloalkylalso includes ring systems substituted with one or more oxo (=0) oroxide (—O⁻) substituents, such as piperidinyl N-oxide,morpholinyl-N-oxide, 1-oxo-1-thiomorpholinyl and1,1-dioxo-1-thiomorpholinyl.

“Heterocycloalkyl” also includes bicyclic ring systems wherein onenon-aromatic ring, usually with 3 to 7 ring atoms, contains at least 2carbon atoms in addition to 1-3 heteroatoms independently selected fromoxygen, sulfur, and nitrogen, as well as combinations comprising atleast one of the foregoing heteroatoms; and the other ring, usually with3 to 7 ring atoms, optionally contains 1-3 heteratoms independentlyselected from oxygen, sulfur, and nitrogen and is not aromatic.

As used herein, “modulation” refers to a change in activity as a director indirect response to the presence of a chemical entity as describedherein, relative to the activity of in the absence of the chemicalentity. The change may be an increase in activity or a decrease inactivity, and may be due to the direct interaction of the compound withthe a target or due to the interaction of the compound with one or moreother factors that in turn affect the target's activity. For example,the presence of the chemical entity may, for example, increase ordecrease the target activity by directly binding to the target, bycausing (directly or indirectly) another factor to increase or decreasethe target activity, or by (directly or indirectly) increasing ordecreasing the amount of target present in the cell or organism.

The term “sulfanyl” includes the groups: —S-(optionally substituted(C₁-C₆)alkyl), —S-(optionally substituted aryl), —S-(optionallysubstituted heteroaryl), and —S-(optionally substitutedheterocycloalkyl). Hence, sulfanyl includes the group C₁-C₆alkylsulfanyl.

The term “sulfinyl” includes the groups: —S(O)-(optionally substituted(C₁-C₆)alkyl), —S(O)-optionally substituted aryl), —S(O)-optionallysubstituted heteroaryl), —S(O)-(optionally substitutedheterocycloalkyl); and —S(O)-(optionally substituted amino).

The term “sulfonyl” includes the groups: —S(O₂)-(optionally substituted(C₁-C₆)alkyl), —S(O₂)-optionally substituted aryl), —S(O₂)-optionallysubstituted heteroaryl), —S(O₂)-(optionally substitutedheterocycloalkyl), —S(O₂)-(optionally substituted alkoxy),—S(O₂)-optionally substituted aryloxy), —S(O₂)-optionally substitutedheteroaryloxy), —S(O₂)-(optionally substituted heterocyclyloxy); and—S(O₂)-(optionally substituted amino).

The term “substituted”, as used herein, means that any one or morehydrogens on the designated atom or group is replaced with a selectionfrom the indicated group, provided that the designated atom's normalvalence is not exceeded. When a substituent is oxo (i.e., ═O) then 2hydrogens on the atom are replaced. Combinations of substituents and/orvariables are permissible only if such combinations result in stablecompounds or useful synthetic intermediates. A stable compound or stablestructure is meant to imply a compound that is sufficiently robust tosurvive isolation from a reaction mixture, and subsequent formulation asan agent having at least practical utility. Unless otherwise specified,substituents are named into the core structure. For example, it is to beunderstood that when (cycloalkyl)alkyl is listed as a possiblesubstituent, the point of attachment of this substituent to the corestructure is in the alkyl portion.

The terms “substituted” alkyl, cycloalkyl, aryl, heterocycloalkyl, andheteroaryl, unless otherwise expressly defined, refer respectively toalkyl, cycloalkyl, aryl, heterocycloalkyl, and heteroaryl wherein one ormore (such as up to 5, for example, up to 3) hydrogen atoms are replacedby a substituent independently chosen from:

-   -   R^(a), —OR^(b), optionally substituted amino (including        —NR^(c)COR^(b), —NR^(c)CO₂R^(a), —NR^(c)CONR^(b)R^(c),        —NR^(b)C(NR^(c))NR^(b)R^(c), —NR^(b)C(NCN)NR^(b)R^(c), and        —NR^(c)SO₂R^(a)), halo, cyano, nitro, oxo (as a substitutent for        cycloalkyl, heterocycloalkyl, and heteroaryl), optionally        substituted acyl (such as —COR^(b)), optionally substituted        alkoxycarbonyl (such as —CO₂R^(b)), optionally substituted        aminocarbonyl (such as —CONR^(b)R^(c)), —OCOR^(b), —OCO₂R^(a),        —OCONR^(b)R^(c), —OP(O)(OR^(b))OR^(c), sulfanyl (such as        SR^(b)), sulfinyl (such as —SOR^(a)), and sulfonyl (such as        —SO₂R^(a) and —SO₂NR^(b)R^(c)),    -   where R^(a) is chosen from optionally substituted C₁-C₆ alkyl,        optionally substituted cycloalkyl, optionally substituted        heterocycloalkyl, optionally substituted alkenyl, optionally        substituted alkynyl, optionally substituted aryl, and optionally        substituted heteroaryl;    -   R^(b) is chosen from hydrogen, optionally substituted C₁-C₆        alkyl, optionally substituted cycloalkyl, optionally substituted        heterocycloalkyl, optionally substituted aryl, and optionally        substituted heteroaryl; and    -   R^(c) is independently chosen from hydrogen and optionally        substituted C₁-C₄ alkyl; or    -   R^(b) and R^(c), and the nitrogen to which they are attached,        form an optionally substituted heterocycloalkyl group; and    -   where each optionally substituted group is unsubstituted or        independently substituted with one or more, such as one, two, or        three, substituents independently selected from C₁-C₄ alkyl,        aryl, heteroaryl, aryl-C₁-C₄ alkyl-, heteroaryl-C₁-C₄ alkyl-,        C₁-C₄ haloalkyl, —OC₁-C₄ alkyl, —OC₁-C₄ alkylphenyl, —C₁-C₄        alkyl-OH, —OC₁-C₄ haloalkyl, halo, —OH, —NH₂, —C₁-C₄ alkyl-NH₂,        —N(C₁-C₄ alkyl)(C₁-C₄ alkyl), —NH(C₁-C₄ alkyl), —N(C₁-C₄        alkyl)(C₁-C₄ alkylphenyl), —NH(C₁-C₄ alkylphenyl), cyano, nitro,        oxo (as a substitutent for cycloalkyl, heterocycloalkyl, or        heteroaryl), —CO₂H, —C(O)OC₁-C₄ alkyl, —CON(C₁-C₄ alkyl)(C₁-C₄        alkyl), —CONH(C₁-C₄ alkyl), —CONH₂, —NHC(O)(C₁-C₄ alkyl),        —NHC(O)(phenyl), —N(C₁-C₄ alkyl)C(O)(C₁-C₄ alkyl), —N(C₁-C₄        alkyl)C(O)(phenyl), —C(O)C₁-C₄ alkyl, —C(O)C₁-C₄ alkylphenyl,        —C(O)C₁-C₄ haloalkyl, —OC(O)C₁-C₄ alkyl, —SO₂(C₁-C₄ alkyl),        —SO₂(phenyl), —SO₂(C₁-C₄ haloalkyl), —SO₂NH₂, —SO₂NH(C₁-C₄        alkyl), —SO₂NH(phenyl), —NHSO₂(C₁-C₄ alkyl), —NHSO₂(phenyl), and        —NHSO₂(C₁-C₄ haloalkyl).

The term “substituted acyl” refers to the groups (substitutedalkyl)-C(O)—; (substituted cycloalkyl)-C(O)—; (substituted aryl)-C(O)—;(substituted heteroaryl)-C(O)—; and (substitutedheterocycloalkyl)-C(O)—, wherein the group is attached to the parentstructure through the carbonyl functionality and wherein substitutedalkyl, cycloalkyl, aryl, heteroaryl, and heterocycloalkyl, referrespectively to alkyl, cycloalkyl, aryl, heteroaryl, andheterocycloalkyl wherein one or more (such as up to 5, for example, upto 3) hydrogen atoms are replaced by a substituent independently chosenfrom:

-   -   —R^(a), —OR^(b), optionally substituted amino (including        —NR^(c)COR^(b), —NR^(c)CO₂R^(a), —NR^(c)CONR^(b)R^(c),        —NR^(b)C(NR^(c))NR^(b)R^(c), —NR^(b)C(NCN)NR^(b)R^(c), and        —NR^(c)SO₂R^(a)), halo, cyano, nitro, oxo (as a substitutent for        cycloalkyl, heterocycloalkyl, and heteroaryl), optionally        substituted acyl (such as —COR^(b)), optionally substituted        alkoxycarbonyl (such as —CO₂R^(b)), optionally substituted        aminocarbonyl (such as —CONR^(b)R^(c)), —OCOR^(b), —OCO₂R^(a),        —OCONR^(b)R^(c), —OP(O)(OR^(b))OR^(c), sulfanyl (such as        SR^(b)), sulfinyl (such as —SOR^(a)), and sulfonyl (such as        —SO₂R^(a) and —SO₂NR^(b)R^(c)),    -   where R^(a) is chosen from optionally substituted C₁-C₆ alkyl,        optionally substituted alkenyl, optionally substituted alkynyl,        optionally substituted aryl, and optionally substituted        heteroaryl;    -   R^(b) is chosen from H, optionally substituted C₁-C₆ alkyl,        optionally substituted cycloalkyl, optionally substituted        heterocycloalkyl, optionally substituted aryl, and optionally        substituted heteroaryl; and    -   R^(c) is independently chosen from hydrogen and optionally        substituted C₁-C₄ alkyl; or    -   R^(b) and R^(c), and the nitrogen to which they are attached,        form an optionally substituted heterocycloalkyl group; and    -   where each optionally substituted group is unsubstituted or        independently substituted with one or more, such as one, two, or        three, substituents independently selected from C₁-C₄ alkyl,        aryl, heteroaryl, aryl-C₁-C₄ alkyl-, heteroaryl-C₁-C₄ alkyl-,        C₁-C₄ haloalkyl, —OC₁-C₄ alkyl, —OC₁-C₄ alkylphenyl, —C₁-C₄        alkyl-OH, —OC₁-C₄ haloalkyl, halo, —OH, —NH₂, —C₁-C₄ alkyl-NH₂,        —N(C₁-C₄ alkyl)(C₁-C₄ alkyl), —NH(C₁-C₄ alkyl), —N(C₁-C₄        alkyl)(C₁-C₄ alkylphenyl), —NH(C₁-C₄ alkylphenyl), cyano, nitro,        oxo (as a substituent for cycloalkyl, heterocycloalkyl, or        heteroaryl), —CO₂H, —C(O)OC₁-C₄ alkyl, —CON(C₁-C₄ alkyl)(C₁-C₄        alkyl), —CONH(C₁-C₄ alkyl), —CONH₂, —NHC(O)(C₁-C₄ alkyl),        —NHC(O)(phenyl), —N(C₁-C₄ alkyl)C(O)(C₁-C₄ alkyl), —N(C₁-C₄        alkyl)C(O)(phenyl), —C(O)C₁-C₄ alkyl, —C(O)C₁-C₄ alkylphenyl,        —C(O)C₁-C₄ haloalkyl, —OC(O)C₁-C₄ alkyl, —SO₂(C₁-C₄ alkyl),        —SO₂(phenyl), —SO₂(C₁-C₄ haloalkyl), —SO₂NH₂, —SO₂NH(C₁-C₄        alkyl), —SO₂NH(phenyl), —NHSO₂(C₁-C₄ alkyl), —NHSO₂(phenyl), and        —NHSO₂(C₁-C₄ haloalkyl).

The term “substituted alkoxy” refers to alkoxy wherein the alkylconstituent is substituted (i.e., —O-(substituted alkyl)) wherein“substituted alkyl” refers to alkyl wherein one or more (such as up to5, for example, up to 3) hydrogen atoms are replaced by a substituentindependently chosen from:

—R^(a), —OR^(b), optionally substituted amino (including —NR^(c)COR^(b),—NR^(c)CO₂R^(a), —NR^(c)CONR^(b)R^(c), —NR^(b)C(NR^(c))NR^(b)R^(c),—NR^(b)C(NCN)NR bRC, and —NR^(c)SO₂R^(a)), halo, cyano, nitro, oxo (as asubstitutent for cycloalkyl, heterocycloalkyl, and heteroaryl),optionally substituted acyl (such as —COR^(b)), optionally substitutedalkoxycarbonyl (such as —CO₂R^(b)), optionally substituted aminocarbonyl(such as —CONR^(b)R^(c)), —OCOR^(b), —OCO₂R^(a), —OCONR^(b)R^(c),—OP(O)(OR^(b))OR^(c), sulfanyl (such as SR^(b)), sulfinyl (such as—SOR^(a)), and sulfonyl (such as —SO₂R^(a) and —SO₂NR^(b)R^(c)),

-   -   where R^(a) is chosen from optionally substituted C₁-C₆ alkyl,        optionally substituted alkenyl, optionally substituted alkynyl,        optionally substituted aryl, and optionally substituted        heteroaryl;    -   R^(b) is chosen from H, optionally substituted C₁-C₆ alkyl,        optionally substituted cycloalkyl, optionally substituted        heterocycloalkyl, optionally substituted aryl, and optionally        substituted heteroaryl; and    -   R^(c) is independently chosen from hydrogen and optionally        substituted C₁-C₄ alkyl; or    -   R^(b) and R^(c), and the nitrogen to which they are attached,        form an optionally substituted heterocycloalkyl group; and    -   where each optionally substituted group is unsubstituted or        independently substituted with one or more, such as one, two, or        three, substituents independently selected from C₁-C₄ alkyl,        aryl, heteroaryl, aryl-C₁-C₄ alkyl-, heteroaryl-C₁-C₄ alkyl-,        C₁-C₄ haloalkyl, —OC₁-C₄ alkyl, —OC₁-C₄ alkylphenyl, —C₁-C₄        alkyl-OH, —OC₁-C₄ haloalkyl, halo, —OH, —NH₂, —C₁-C₄ alkyl-NH₂,        —N(C₁-C₄ alkyl)(C₁-C₄ alkyl), —NH(C₁-C₄ alkyl), —N(C₁-C₄        alkyl)(C₁-C₄ alkylphenyl), —NH(C₁-C₄ alkylphenyl), cyano, nitro,        oxo (as a substitutent for cycloalkyl, heterocycloalkyl, or        heteroaryl), —CO₂H, —C(O)OC₁-C₄ alkyl, —CON(C₁-C₄ alkyl)(C₁-C₄        alkyl), —CONH(C₁-C₄ alkyl), —CONH₂, —NHC(O)(C₁-C₄ alkyl),        —NHC(O)(phenyl), —N(C₁-C₄ alkyl)C(O)(C₁-C₄ alkyl), —N(C₁-C₄        alkyl)C(O)(phenyl), —C(O)C₁-C₄ alkyl, —C(O)C₁-C₄ alkylphenyl,        —C(O)C₁-C₄ haloalkyl, —OC(O)C₁-C₄ alkyl, —SO₂(C₁-C₄ alkyl),        —SO₂(phenyl), —SO₂(C₁-C₄ haloalkyl), —SO₂NH₂, —SO₂NH(C₁-C₄        alkyl), —SO₂NH(phenyl), —NHSO₂(C₁-C₄ alkyl), —NHSO₂(phenyl), and        —NHSO₂(C₁-C₄ haloalkyl). In some embodiments, a substituted        alkoxy group is “polyalkoxy” or —O-(optionally substituted        alkylene)-(optionally substituted alkoxy), and includes groups        such as —OCH₂CH₂OCH₃, and residues of glycol ethers such as        polyethyleneglycol, and —O(CH₂CH₂O)_(n)CH₃, where x is an        integer of 2-20, such as 2-10, and for example, 2-5. Another        substituted alkoxy group is hydroxyalkoxy or —OCH₂(CH₂)_(y)OH,        where y is an integer of 1-10, such as 1-4.

The term “substituted alkoxycarbonyl” refers to the group (substitutedalkyl)-O—C(O)— wherein the group is attached to the parent structurethrough the carbonyl functionality and wherein substituted refers toalkyl wherein one or more (such as up to 5, for example, up to 3)hydrogen atoms are replaced by a substituent independently chosen from:

-   -   —R^(a), —OR^(b), optionally substituted amino (including        —NR^(c)COR^(b), —NR^(c)CO₂R^(a), —NR^(c)CONR^(b)R^(c),        —NR^(b)C(NR^(c))NR^(b)R^(c), —NR^(b)C(NCN)NR^(b)R^(c), and        —NR^(c)SO₂R^(a)), halo, cyano, nitro, oxo (as a substitutent for        cycloalkyl, heterocycloalkyl, and heteroaryl), optionally        substituted acyl (such as —COR^(b)), optionally substituted        alkoxycarbonyl (such as —CO₂R^(b)), optionally substituted        aminocarbonyl (such as —CONR^(b)R^(c)), —OCOR^(b), —OCO₂R^(a),        —OCONR^(b)R^(c), —OP(O)(OR^(b))OR^(c), sulfanyl (such as        SR^(b)), sulfinyl (such as —SOR^(a)), and sulfonyl (such as        —SO₂R^(a) and —SO₂NR^(b)R^(c)),    -   where R^(a) is chosen from optionally substituted C₁-C₆ alkyl,        optionally substituted alkenyl, optionally substituted alkynyl,        optionally substituted aryl, and optionally substituted        heteroaryl;    -   R^(b) is chosen from H, optionally substituted C₁-C₆ alkyl,        optionally substituted cycloalkyl, optionally substituted        heterocycloalkyl, optionally substituted aryl, and optionally        substituted heteroaryl; and    -   R^(c) is independently chosen from hydrogen and optionally        substituted C₁-C₄ alkyl; or    -   R^(b) and R^(c), and the nitrogen to which they are attached,        form an optionally substituted heterocycloalkyl group; and    -   where each optionally substituted group is unsubstituted or        independently substituted with one or more, such as one, two, or        three, substituents independently selected from C₁-C₄ alkyl,        aryl, heteroaryl, aryl-C₁-C₄ alkyl-, heteroaryl-C₁-C₄ alkyl-,        C₁-C₄ haloalkyl, —OC₁-C₄ alkyl, —OC₁-C₄ alkylphenyl, —C₁-C₄        alkyl-OH, —OC₁-C₄ haloalkyl, halo, —OH, —NH₂, —C₁-C₄ alkyl-NH₂,        —N(C₁-C₄ alkyl)(C₁-C₄ alkyl), —NH(C₁-C₄ alkyl), —N(C₁-C₄        alkyl)(C₁-C₄ alkylphenyl), —NH(C₁-C₄ alkylphenyl), cyano, nitro,        oxo (as a substitutent for cycloalkyl, heterocycloalkyl, or        heteroaryl), —CO₂H, —C(O)OC₁-C₄ alkyl, —CON(C₁-C₄ alkyl)(C₁-C₄        alkyl), —CONH(C₁-C₄ alkyl), —CONH₂, —NHC(O)(C₁-C₄ alkyl),        —NHC(O)(phenyl), —N(C₁-C₄ alkyl)C(O)(C₁-C₄ alkyl), —N(C₁-C₄        alkyl)C(O)(phenyl), —C(O)C₁-C₄ alkyl, —C(O)C₁-C₄ alkylphenyl,        —C(O)C₁-C₄ haloalkyl, —OC(O)C₁-C₄ alkyl, —SO₂(C₁-C₄ alkyl),        —SO₂(phenyl), —SO₂(C₁-C₄ haloalkyl), —SO₂NH₂, —SO₂NH(C₁-C₄        alkyl), —SO₂NH(phenyl), —NHSO₂(C₁-C₄ alkyl), —NHSO₂(phenyl), and        —NHSO₂(C₁-C₄ haloalkyl).

The term “substituted amino” refers to the group —NHR^(d) or—NR^(d)R^(e) wherein R^(d) is chosen from: hydroxy, optionallysubstituted alkoxy, optionally substituted alkyl, optionally substitutedcycloalkyl, optionally substituted acyl, optionally substitutedcarbamimidoyl, optionally substituted aminocarbonyl, optionallysubstituted aryl, optionally substituted heteroaryl, optionallysubstituted heterocycloalkyl, optionally substituted alkoxycarbonyl,sulfinyl and sulfonyl, and wherein R^(e) is chosen from: optionallysubstituted alkyl, optionally substituted cycloalkyl, optionallysubstituted aryl, optionally substituted heteroaryl, and optionallysubstituted heterocycloalkyl, and wherein substituted alkyl, cycloalkyl,aryl, heterocycloalkyl, and heteroaryl refer respectively to alkyl,cycloalkyl, aryl, heterocycloalkyl, and heteroaryl wherein one or more(such as up to 5, for example, up to 3) hydrogen atoms are replaced by asubstituent independently chosen from:

-   -   —R^(a), —OR^(b), optionally substituted amino (including        —NR^(c)COR^(b), —NR^(c)CO₂R^(a), —NR^(c)CONR^(b)R^(c),        —NR^(b)C(NR^(c))NR^(b)R^(c), —NR^(b)C(NCN)NR^(b)R^(c), and        —NR^(c)SO₂R^(a)), halo, cyano, nitro, oxo (as a substitutent for        cycloalkyl, heterocycloalkyl, and heteroaryl), optionally        substituted acyl (such as —COR^(b)), optionally substituted        alkoxycarbonyl (such as —CO₂R^(b)), optionally substituted        aminocarbonyl (such as —CONR^(b)R^(c)), —OCOR^(b), —OCO₂R^(a),        —OCONR^(b)R^(c), —OP(O)(OR^(b))OR^(c), sulfanyl (such as        SR^(b)), sulfinyl (such as —SOR^(a)), and sulfonyl (such as        —SO₂R^(a) and —SO₂NR^(b)R^(c)),    -   where R^(a) is chosen from optionally substituted C₁-C₆ alkyl,        optionally substituted alkenyl, optionally substituted alkynyl,        optionally substituted aryl, and optionally substituted        heteroaryl;    -   R^(b) is chosen from H, optionally substituted C₁-C₆ alkyl,        optionally substituted cycloalkyl, optionally substituted        heterocycloalkyl, optionally substituted aryl, and optionally        substituted heteroaryl; and    -   R^(c) is independently chosen from hydrogen and optionally        substituted C₁-C₄ alkyl; or    -   R^(b) and R^(c), and the nitrogen to which they are attached,        form an optionally substituted heterocycloalkyl group; and    -   where each optionally substituted group is unsubstituted or        independently substituted with one or more, such as one, two, or        three, substituents independently selected from C₁-C₄ alkyl,        aryl, heteroaryl, aryl-C₁-C₄ alkyl-, heteroaryl-C₁-C₄ alkyl-,        C₁-C₄ haloalkyl, —OC₁-C₄ alkyl, —OC₁-C₄ alkylphenyl, —C₁-C₄        alkyl-OH, —OC₁-C₄ haloalkyl, halo, —OH, —NH₂, —C₁-C₄ alkyl-NH₂,        —N(C₁-C₄ alkyl)(C₁-C₄ alkyl), —NH(C₁-C₄ alkyl), —N(C₁-C₄        alkyl)(C₁-C₄ alkylphenyl), —NH(C₁-C₄ alkylphenyl), cyano, nitro,        oxo (as a substitutent for cycloalkyl, heterocycloalkyl, or        heteroaryl), —CO₂H, —C(O)OC₁-C₄ alkyl, —CON(C₁-C₄ alkyl)(C₁-C₄        alkyl), —CONH(C₁-C₄ alkyl), —CONH₂, —NHC(O)(C₁-C₄ alkyl),        —NHC(O)(phenyl), —N(C₁-C₄ alkyl)C(O)(C₁-C₄ alkyl), —N(C₁-C₄        alkyl)C(O)(phenyl), —C(O)C₁-C₄ alkyl, —C(O)C₁-C₄ alkylphenyl,        —C(O)C₁-C₄ haloalkyl, —OC(O)C₁-C₄ alkyl, —SO₂(C₁-C₄ alkyl),        —SO₂(phenyl), —SO₂(C₁-C₄ haloalkyl), —SO₂NH₂, —SO₂NH(C₁-C₄        alkyl), —SO₂NH(phenyl), —NHSO₂(C₁-C₄ alkyl), —NHSO₂(phenyl), and        —NHSO₂(C₁-C₄ haloalkyl); and    -   wherein optionally substituted acyl, optionally substituted        alkoxycarbonyl, sulfinyl and sulfonyl are as defined herein.

The term “substituted amino” also refers to N-oxides of the groups—NHR^(d), and NR^(d)R^(d) each as described above. N-oxides can beprepared by treatment of the corresponding amino group with, forexample, hydrogen peroxide or m-chloroperoxybenzoic acid. The personskilled in the art is familiar with reaction conditions for carrying outthe N-oxidation.

Compounds of Formula I include, but are not limited to, optical isomersof compounds of Formula I, racemates, and other mixtures thereof. Inthose situations, the single enantiomers or diastereomers, i.e.,optically active forms, can be obtained by asymmetric synthesis or byresolution of the racemates. Resolution of the racemates can beaccomplished, for example, by conventional methods such ascrystallization in the presence of a resolving agent, or chromatography,using, for example a chiral high-pressure liquid chromatography (HPLC)column. In addition, compounds of Formula I include Z- and E-forms (orcis- and trans-forms) of compounds with carbon-carbon double bonds.Where compounds of Formula I exists in various tautomeric forms,chemical entities described herein include all tautomeric forms of thecompound.

Chemical entities described herein include, but are not limited tocompounds of Formula I and all pharmaceutically acceptable formsthereof. Pharmaceutically acceptable forms of the chemical entitiesrecited herein include pharmaceutically acceptable salts, solvates,crystal forms (including polymorphs and clathrates), chelates,non-covalent complexes, prodrugs, and mixtures thereof. In certainembodiments, the chemical entities described herein are in the form ofpharmaceutically acceptable salts. Hence, the terms “chemical entity”and “chemical entities” also encompass pharmaceutically acceptablesalts, solvates, chelates, non-covalent complexes, prodrugs, andmixtures.

“Pharmaceutically acceptable salts” include, but are not limited tosalts with inorganic acids, such as hydrochloride, phosphate,diphosphate, hydrobromide, sulfate, sulfinate, nitrate, and like salts;as well as salts with an organic acid, such as malate, maleate,fumarate, tartrate, succinate, citrate, lactate, methanesulfonate,p-toluenesulfonate, 2-hydroxyethylsulfonate, benzoate, salicylate,stearate, and alkanoate such as acetate, HOOC—(CH₂)_(n)—COOH where n is0-4, and like salts. Similarly, pharmaceutically acceptable cationsinclude, but are not limited to sodium, potassium, calcium, aluminum,lithium, and ammonium.

In addition, if the compound of Formula I is obtained as an acidaddition salt, the free base can be obtained by basifying a solution ofthe acid salt. Conversely, if the product is a free base, an additionsalt, particularly a pharmaceutically acceptable addition salt, may beproduced by dissolving the free base in a suitable organic solvent andtreating the solution with an acid, in accordance with conventionalprocedures for preparing acid addition salts from base compounds. Thoseskilled in the art will recognize various synthetic methodologies thatmay be used to prepare non-toxic pharmaceutically acceptable additionsalts.

As noted above, prodrugs also fall within the scope of chemicalentities, for example ester or amide derivatives of the compounds ofFormula I. The term “prodrugs” includes any chemical entities thatbecome compounds of Formula I when administered to a patient, e.g., uponmetabolic processing of the prodrug. Examples of prodrugs include, butare not limited to, acetate, formate, phosphate, and benzoate and likederivatives of functional groups (such as alcohol or amine groups) inthe compounds of Formula I.

The term “solvate” refers to the chemical entity formed by theinteraction of a solvent and a compound. Suitable solvates arepharmaceutically acceptable solvates, such as hydrates, includingmonohydrates and hemi-hydrates.

The term “chelate” refers to the chemical entity formed by thecoordination of a compound to a metal ion at two (or more) points.

The term “non-covalent complex” refers to the chemical entity formed bythe interaction of a compound and another molecule wherein a covalentbond is not formed between the compound and the molecule. For example,complexation can occur through van der Waals interactions, hydrogenbonding, and electrostatic interactions (also called ionic bonding).

The term “active agent” is used to indicate a chemical entity which hasbiological activity. In certain embodiments, an “active agent” is acompound having pharmaceutical utility. For example an active agent maybe an anti-cancer therapeutic.

By “significant” is meant any detectable change that is statisticallysignificant in a standard parametric test of statistical significancesuch as Student's T-test, where p<0.05.

The term “therapeutically effective amount” of a chemical entitydescribed herein means an amount effective, when administered to a humanor non-human patient, to provide a therapeutic benefit such asamelioration of symptoms, slowing of disease progression, or preventionof disease.

“Treatment” or “treating” means any treatment of a disease in a patient,including:

-   -   a) preventing the disease, that is, causing the clinical        symptoms of the disease not to develop;    -   b) inhibiting the disease;    -   c) slowing or arresting the development of clinical symptoms;        and/or    -   d) relieving the disease, that is, causing the regression of        clinical symptoms.

“Patient” refers to an animal, such as a mammal, that has been or willbe the object of treatment, observation or experiment. The methodsdescribed herein can be useful in both human therapy and veterinaryapplications. In some embodiments, the patient is a mammal; in someembodiments the patient is human; and in some embodiments the patient ischosen from cats and dogs.

Provided is at least one chemical entity chosen from compounds ofFormula I

-   -   and pharmaceutically acceptable salts thereof wherein    -   R¹ and R⁴ are independently chosen from hydrogen, cyano, halo,        hydroxy, azido, nitro, sulfonyl, sulfinyl, sulfanyl, optionally        substituted alkoxy, optionally substituted acyloxy, optionally        substituted aminocarbonyloxy, optionally substituted aryloxy,        optionally substituted heteroaryloxy, optionally substituted        heterocycloalkyloxy, optionally substituted alkoxycarbonyl,        optionally substituted alkyl, optionally substituted alkenyl,        optionally substituted alkynyl, optionally substituted aryloxy,        optionally substituted aryl, optionally substituted heteroaryl,        optionally substituted heterocycloalkyl, optionally substituted        amino, optionally substituted acyl, optionally substituted        aminocarbonyl, and optionally substituted carbaminodoyl;    -   Z¹ is chosen from hydrogen, cyano, optionally substituted alkyl,        optionally substituted acyl, optionally substituted        alkoxycarbonyl, optionally substituted amino, optionally        substituted aminocarbonyl, optionally substituted carbamimidoyl,        optionally substituted alkoxy, optionally substituted aryloxy,        optionally substituted heteroaryloxy, optionally substituted        heterocycloalkyloxy, optionally substituted alkenyl, optionally        substituted alkynyl, sulfonyl, sulfinyl, and sulfanyl;    -   Z² is chosen from hydrogen, optionally substituted amidino,        carboxyl, optionally substituted alkoxycarbonyl, optionally        substituted acyl, optionally substituted alkenyl, optionally        substituted alkyl, optionally substituted heterocycloalkyl,        optionally substituted heteroaryl, and optionally substituted        aminocarbonyl;

Z³ is chosen from optionally substituted alkyl; and

R³ is chosen from hydrogen and optionally substituted alkyl.

In certain embodiments, Z² is chosen from carboxyl, optionallysubstituted alkoxycarbonyl, optionally substituted acyl, optionallysubstituted alkenyl, and optionally substituted alkyl.

In certain embodiments, Z² is chosen from carboxyl, optionallysubstituted piperidinylcarbonyl, optionally substitutedpyridinylcarbonyl, optionally substituted lower alkyl, optionallysubstituted lower alkenyl, and lower alkoxycarbonyl.

In certain embodiments, Z² is chosen from (2-(N-acetylaminomethyl)piperidin-1-yl)carbonyl; (2-aminomethylpiperidin-1-yl)carbonyl;1-hydroxy -2-amino-ethyl;2-((methylsulfonamido)methyl)piperidin-1-ylcarbonyl;2-(methylaminocarbonyl)ethenyl;2-(pyridin-3-ylmethyl)-2H-tetrazol-5-ylmethyl; aminomethyl; carboxyl;methoxycarbonyl; pyridin-2-ylcarbonyl; pyridin-3-ylcarbonyl; andpyridin-4-ylcarbonyl.

In certain embodiments, R³ is chosen from hydrogen and optionallysubstituted lower alkyl. In certain embodiments, R³ is chosen fromhydrogen and lower alkyl. In certain embodiments, R³ is chosen fromhydrogen and methyl. In certain embodiments, R³ is hydrogen.

In certain embodiments, R⁴ is chosen from hydrogen, cyano, halo, azido,optionally substituted aminocarbonyl, and optionally substituted alkyl.In certain embodiments, R⁴ is chosen from hydrogen, cyano, chloro,bromo, fluoro, azido, optionally substituted alkylaminocarbonyl, andoptionally substituted methyl. In certain embodiments, R⁴ is chosen fromhydrogen, cyano, chloro, bromo, azido, pyridin-3-ylmethylaminocarbonyl,aminomethyl, and hydroxymethyl. In certain embodiments, R⁴ is hydrogen.

In certain embodiments, R⁵ is chosen from hydrogen and lower alkyl. Incertain embodiments, R⁵ is chosen from hydrogen and methyl. In certainembodiments, R⁵ is hydrogen.

In certain embodiments, Z² is —C(O)—NR²R⁵ wherein R² is chosen fromoptionally substituted alkyl and optionally substituted cycloalkyl; andR⁵ is chosen from hydrogen and optionally substituted alkyl.

In certain embodiments, R² is chosen from optionally substituted methyl,optionally substituted ethyl, optionally substituted propyl, optionallysubstituted butyl, optionally substituted pentyl, optionally substitutedhexyl, optionally substituted cyclopropyl, optionally substitutedcyclopentyl, and optionally substituted cyclohexyl where each optionallysubstituted group is optionally substituted with one, two or threegroups selected from optionally substituted aryl, optionally substitutedheteroaryl, optionally substituted heterocycloalkyl, optionallysubstituted cycloalkyl, optionally substituted aminocarbonyl, optionallysubstituted amino, hydroxy, carboxyl, optionally substitutedalkoxycarbonyl, and optionally substituted alkoxy.

In certain embodiments, R² is chosen from methyl and ethyl, where themethyl and ethyl groups are optionally substituted with one or twogroups selected from optionally substituted aryl, optionally substitutedheteroaryl, optionally substituted heterocycloalkyl, optionallysubstituted cycloalkyl, optionally substituted aminocarbonyl, optionallysubstituted amino, hydroxy, carboxyl, optionally substitutedalkoxycarbonyl, and optionally substituted alkoxy.

In certain embodiments, R² is chosen from(1-(2-aminoethyl)-1H-pyrazol-3-yl)methyl;(1-(methylsulfonyl)piperidin-3-yl)methyl;(1-acetylpiperidin-3-yl)methyl; (1-acetylpyrrolidin-2-yl)methyl;(1H-imidazol-2-yl)methyl; (1H-pyrazol-3-yl)methyl;(1-methyl-1H-pyrazol-3-yl)methyl; (1-methyl-1H-pyrazol-5-yl)methyl;(2-(aminocarbonyl)ethylamino)carbonylmethyl;(2-(aminomethyl)pyridin-3-yl)methyl;(2-(carboxy)ethylamino)carbonylmethyl;(2-(dimethylamino)ethylamino)carbonylmethyl;(2-(hydroxy)ethylamino)carbonylmethyl;(2-(methylamino)ethylamino)carbonylmethyl;(2-(N-methyl-N-(t-butoxycarbonyl)-amino)ethylamino)carbonylmethyl;(2-oxopiperidin-3-yl)methyl;(3-(dimethylamino)propylamino)carbonylmethyl;(3-(hydroxy)ethylamino)carbonylmethyl;(3-(t-butoxycarbonylamino)propylamino)carbonylmethyl;(4-(aminomethyl)pyridin-2-yl)methyl;(5-(aminomethyl)pyridin-2-yl)methyl;(6-((1,3-dioxoisoindolin-2-yl)methyl)pyridin-2-yl)methyl;(6-(2-aminoethylamino)pyridin-2-yl)methyl;(6-(3-aminopropylamino)pyridin-2-yl)methyl;(6-(aminomethyl)pyridin-2-yl)methyl;(6-(hydroxymethyl)pyridin-2-yl)methyl; (6-bromopyridin-2-yl)methyl;(methylsulfonamido)carbonylmethyl; (pyridin-2-yl)ethylamino;1-(2-(tert-butoxycarbonylamino)ethyl)-1H-pyrazol-3-ylmethyl;1-(2-(tert-butoxycarbonylamino)ethyl)-1H-pyrazol-5-ylmethyl;1-(aminocarbonyl)-2-(amino)-eth-1-yl;1-(aminocarbonyl)-3-(amino)-propyl; 1-(aminocarbonyl)-4-(amino)-butyl;1-(aminocarbonyl)-4-(benzyloxycarbonylamino)-pentyl;1-(aminocarbonyl)-5-(amino)-pentyl; 1-(aminocarbonyl)eth-1-yl;1-(carboxy)-2-(amino)-eth-1-yl;1-(dimethylaminocarbonyl)-2-(amino)-eth-1-yl;1-(hydroxy)-2-(aminocarbonylmethylamino)eth-1-yl;1-(hydroxy)-2-(ethoxycarbonylmethylamino)eth-1-yl;1-(hydroxy)-2-(pyridin-2-ylmethylamino)eth-1-yl;1-(methoxycarbonyl)-2-(amino)-eth-1-yl;1-(methoxycarbonyl)-2-(t-butoxycarbonylamino)-eth-1-yl;1-(methoxycarbonyl)eth-1-yl; 1-(methylaminocarbonyl)-2-(amino)-eth-1-yl(2 occ); 1-(methylaminocarbonyl)eth-1-yl;1-aminocarbonyl-2-hydroxy-eth-1-yl;1-methoxycarbonyl-2-hydroxy-eth-1-yl; 2-(2-aminoethoxy)ethyl;2-(2-aminoethyl)-pyridin-6-ylmethyl; 2-(2-aminoethylamino)ethyl;2-(3-fluorophenyl)ethyl; 2-(3-methoxycarbonyl)ethyl;2-(6-(aminomethyl)pyridin-2-yl)ethyl; 2-(acetylamino)ethyl;2-(amino)ethyl; 2-(aminocarbonyl)-2-(acetylamino)-eth-1-yl;2-(aminocarbonyl)-2-(amino)-eth-1-yl; 2-(aminocarbonyl)ethyl;2-(aminomethyl)pyridin-5-ylmethyl; 2-(carboxy)-2-(amino)-eth-1-yl;2-(dimethylamino)ethyl; 2-(dimethylaminocarbonyl)-2-(amino)-eth-1-yl;2-(ethoxycarbonyl)ethyl; 2-(methoxycarbonyl)-2-(acetylamino)-eth-1-yl;2-(methoxycarbonyl)-2-(amino)-eth-1-yl; 2-(methoxycarbonylamino)ethyl;2-(methylamino)ethyl; 2-(methylaminocarbonyl)-2-(acetylamino)-eth-1-yl;2-(methylaminocarbonyl)-2-(amino)-eth-1-yl; 2-(methylsulfonamido)ethyl;2-(methyoxycarbonyl)-2-(amino)-eth-1-yl;2-(N-(t-butoxycarbonyl)-N-(methyl)-amino)ethyl; 2-(piperazin-1-yl)ethyl;2-(pyrazin-2-yl)ethyl; 2-(pyridin-2-yl)ethyl; 2-(pyridin-3-yl)ethyl;2-(t-butoxycarbonylaminomethyl)pyridin-3-ylmethyl;2-(t-butoxycarbonylaminomethyl)pyridin-6-ylmethyl;2-(trifluoromethyl)-pyridin-6-ylmethyl; 2-aminopyridin-3-ylmethyl;2-aminopyridin-5-ylmethyl; 2-chloropyridin-5-ylmethyl;2-cyanopyridin-5-ylmethyl; 2-hydroxy-3-amino-prop-1-yl; 2-hydroxyethyl;2-methoxyeth-1-yl; 2-methoxypyridin-3-ylmethyl;2-methoxypyridin-5-ylmethyl; 2-methylpyridin-3-ylmethyl;2-methylpyridin-5-ylmethyl; 2-methylpyridin-6-ylmethyl;3-(2-aminoethyl)cyclohexyl)methyl; 3-(4-methylpiperazin-1-yl)propyl;3-(amino)-3-(methylaminocarbonyl)prop-1-yl; 3-(aminocarbonyl)propyl;3-(aminomethyl)benzyl; 3-(aminomethyl)pyridin-2-ylmethyl;3-(methoxycarbonyl)propyl; 3-(methylaminocarbonyl)propyl;3-(trifluoromethyl)-pyridin-2-ylmethyl; 3,4-difluorobenzyl;3-aminomethylpyridin-4-ylmethyl; 3-aminopropyl; 3-carbamoylcyclopentyl;3-carboxypropyl; 3-hydroxypropyl; 3-methoxypropyl;4-(aminomethyl)-pyridin-2-ylmethyl;4-(N,N-dimethylamino)pyridin-3-ylmethyl;4-(t-butoxycarbonylamino)-morpholinomethyl; 4-aminobutyl;4-aminomethylpyridin-3-ylmethyl; 4-cyanobenzyl; 4-fluorobenzyl;4-methylaminopyridin-3-ylmethyl; 4-methylbenzyl;4-morpholinopyridin-3-ylmethyl; 4-piperazinylpyridin-3-ylmethyl;5-((bis(dimethylamino)methylamino)methyl)pyridin-3-ylmethyl;5-(aminomethyl)pyridin-2-ylmethyl; 5-(aminomethyl)pyridin-3-ylmethyl;5-(hydroxymethyl)pyridin-3-ylmethyl;5-(t-butoxycarbonylaminomethyl)-pyridin-2-ylmethyl;5-(trifluoromethyl)-pyridin-2-ylmethyl; 5-aminopentyl;5-aminopyridin-2-ylmethyl;6-((bis(dimethylamino)methyleneamino)methyl)pyridin-2-yl)methyl;6-(4-acetylpiperazin-1-yl)pyridin-3-ylmethyl);6-(aminomethyl)pyridin-2-yl)methyl; 6-aminohexyl; aminocarbonylmethyl;benzyl; cyclopropylmethyl; dimethylaminocarbonylmethyl; isopropyl;isoxazol-5-ylmethyl; methoxycarbonylmethyl; methyl;methylaminocarbonylmethyl; oxazol-2-ylmethyl; piperidin-4-ylmethyl;prop-2-en-1-yl; pyrazin-2-ylmethyl; pyridin-2-ylmethyl;pyridin-2-ylmethyl-N-oxide; pyridin-3-ylmethyl;pyridin-3-ylmethyl-N-oxide; pyridin-4-ylmethyl; thiophen-2-ylmethyl; andthiophen-3-ylmethyl.

In certain embodiments, Z³ is chosen optionally substituted lower alkyl.

In certain embodiments, Z³ is chosen from optionally substituted methyl,optionally substituted ethyl, and optionally substituted propyl whereinthe methyl, ethyl and propyl groups are optionally substituted with oneor two groups selected from hydroxy, optionally substituted aryl,optionally substituted heteroaryl, optionally substitutedheterocycloalkyl, optionally substituted cycloalkyl, and optionallysubstituted aryloxy.

In certain embodiments, Z³ is chosen from 2-(3-methylphenyl)ethyl,(tetrahydrofuran-2-yl)methyl, 1-hydroxycyclohexylmethyl,2-(1,3-dioxolan-2-yl)ethyl, 2-(1H-imidazol-4-yl)ethyl,2-(1-methyl-1H-imidazol-4-yl)ethyl, 2-(1-methylpiperidin-4-yl)ethyl,2-(2,3-difluorophenyl)ethyl, 2-(2,5-difluorophenyl)ethyl,2-(2,6-difluorophenyl)ethyl, 2-(2-chlorophenyl)ethyl,2-(2-cyanophenyl)ethyl, 2-(2-fluorophenyl)ethyl,2-(2-hydroxyphenyl)ethyl, 2-(2-methoxyphenyl)ethyl,2-(2-methylphenyl)ethyl, 2-(2-oxoimidazolidin-1-yl)ethyl,2-(2-oxopiperidin-1-yl)ethyl, 2-(2-oxopyrrolidin-1-yl)ethyl,2-(3-(trifluoromethyl)phenyl)ethyl, 2-(3,4-difluorophenyl)ethyl,2-(3,5-difluorophenyl)ethyl, 2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyl,2-(3,5-dimethyl-1H-pyrazol-4-yl)ethyl, 2-(3-carbamoylphenyl)ethyl,2-(3-carboxyphenyl)ethyl, 2-(3-cyanophenyl)ethyl,2-(3-fluorophenyl)-2-(hydroxy)-ethyl, 2-(3-fluorophenyl)ethyl,2-(3-fluoropyridin-2-yl)ethyl, 2-(3-methoxycarbonylphenyl)ethyl,2-(3-methoxyphenyl)ethyl, 2-(3-methylphenyl)ethyl,2-(4-aminophenyl)ethyl, 2-(4-chlorophenyl)ethyl,2-(4-fluorophenyl)ethyl, 2-(4-hydroxyphenyl)ethyl,2-(benzo[d][1,3]dioxol-5-yl)ethyl, 2-(furan-2-yl)ethyl,2-(hydroxy)-2-(phenyl)ethyl, 2-(phenyl)ethyl, 2-(pyridin-2-yl)ethyl,2-(pyridin-3-yl)ethyl, 2-(thiophen-2-yl)ethyl, 2-cyclohex-1-enylethyl,2-cyclohexylethyl, 2-morpholinoethyl, 2-phenoxyethyl, 2-phenylprop-1-yl,3-(1H-imidazol-1-yl)prop-1-yl, 3-phenylpropyl, benzyl, chloro,isopentyl, propyl, pyridin-2-ylmethyl, pyridin-3-ylmethyl, andthiophen-3-ylmethyl.

In certain embodiments, Z³ is chosen from 2-(3-fluorophenyl)ethyl and2-(pyridin-2-yl)ethyl.

In certain embodiments, Z¹ is chosen from cyano, halo, optionallysubstituted acyl, optionally substituted alkenyl, optionally substitutedalkoxycarbonyl, optionally substituted alkyl, optionally substitutedamino, optionally substituted aminocarbonyl, and optionally substitutedcarbamimidoyl.

In certain embodiments, Z¹ is chosen from acyl, alkenyl, alkoxycarbonyl,alkyl, amino, aminocarbonyl, and carbamimidoyl, where each group isoptionally substituted by one or two groups selected from cyano, halo,hydroxy, formyl, optionally substituted alkyl, optionally substitutedalkenyl, optionally substituted alkoxy, carboxyl, optionally substitutedalkoxycarbonyl, optionally substituted acyl, optionally substitutedaminocarbonyl, optionally substituted heterocycloalkyl, optionallysubstituted heteroaryl, optionally substituted carbamimidoyl, andoptionally substituted sulfonyl.

In certain embodiments, Z¹ is chosen from(5-oxo-tetrahydrofuran-2-yl)methylamino;(E)-N′-cyano-N,N-dimethylcarbamimidoyl;(Z)-4-(N-(2-hydroxyethyl)-N,N′-bis(methoxycarbonyl)carbamimidoyl);(Z)-but-2-en-2-yl; 1-ethoxyeth-1-yl; 1-ethoxyvinyl;2-hydroxyeth-1-ylamino 2-methoxyeth-1-ylamino; 2-methylprop-1-enyl;3-(methoxycarbonyl)-prop-2-en-2-yl;3-(N,N-dimethylamino)carbonyl-prop-1-ylamino;3-aminocarbonyl-prop-1-ylamino; 3-hydroxyprop-1-ylamino;3-methoxy-prop-1-enyl; 3-methoxyprop-1-ylamino; 3-methoxypropyl;3-methylbut-2-en-2-yl; 4-((pyridin-3-ylmethyl)aminocarbonyl)butylamino;4-(N,N-dimethylamino)carbonyl-but-1-ylamino;4-(N-methylamino)carbonyl-but-1-ylamino; 4-aminocarbonyl-but-1-ylamino;acetyl; aminocarbonyl; carbamimidoyl; chloro; cyano; dimethylamino;ethoxycarbonyl; hydrogen; methoxycarbonyl; methylamino;N-(2-hydroxyethyl)-N-(acetyl)-amino;N-(2-hydroxyethyl)-N-(methyl)-amino;N-(2-hydroxyprop-1-yl)-N-(methyl)-amino; N-(methyl)-aminocarbonyl;N-(pyridin-2-ylmethyl)amino; N-(pyridin-3-ylmethyl)amino;N-(pyridin-4-ylmethyl)amino; N,N-dimethylcarbamimidoyl;N-cyanocarbamimidoyl; N-methyl-N-acetylamino; and prop-1-enyl.

In certain embodiments, R¹ is chosen from hydrogen and optionallysubstituted lower alkyl. In certain embodiments, R¹ is chosen fromhydrogen and lower alkyl. In certain embodiments, R¹ is chosen fromhydrogen and methyl. In certain embodiments, R¹ is hydrogen.

In certain embodiments, the compound of Formula I is chosen from

Compound Chemical Name

N-{[6-(aminomethyl)(2-pyridyl)]methyl}(2-{[2-(3-fluorophenyl)ethyl]amino}-5-(3-pyridyl)(3- pyridyl))carboxamide Compound0

N-{[6-(aminomethyl)(2-pyridyl)]methyl}2-{[2-(3-fluorophenyl)ethyl]amino}-5-(4-pyridyl)(3- pyridyl))carboxamide Compound1

N-{[6-(aminomethyl)(2-pyridyl)]methyl}(2-{[2-(3-fluorophenyl)ethyl]amino}-5-(1-methylpyrazol-4-yl)(3-pyridyl))carboxamide Compound 2

N-{[6-(aminomethyl)(2-pyridyl)]methyl}(5-(2-cyanophenyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))carboxamide Compound 3

(5-cyano-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(2-pyridylmethyl)carboxamide Compound 4

(5-bromo-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-[(6-methyl(2-pyridyl))methyl]carboxamide Compound 5

(5-bromo-6-chloro-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(2-pyridylmethyl)carboxamide Compound 6

5-bromo-2-{[2-(3-fluorophenyl)ethyl]amino}pyridine-3- carboxylic acidCompound 7

methyl 5-cyano-2-{[2-(3-fluorophenyl)ethyl]amino}pyridine- 3-carboxylateCompound 8

N-({6-[(1,3-dioxobenzo[c]azolin-2-yl)methyl](2-pyridyl)}methyl)(5-bromo-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))carboxamide Compound 9

(5-bromo-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(2-pyridylmethyl)carboxamide Compound 10

N-{[6-(aminomethyl)(2-pyridyl)]methyl}(5-bromo-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))carboxamide Compound 11

N-{[6-(aminomethyl)(2-pyridyl)]methyl}(2-{[2-(3-fluorophenyl)ethyl]amino}-5-(2-pyridyl)(3- pyridyl))carboxamide Compound12

methyl 6-[(4-carbamoylbutyl)amino]-2-{[2-(3-fluorophenyl)ethyl]amino}pyridine-3-carboxylate Compound 13

5-[(6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl](2-pyridyl))amino]-N,N- dimethylpentanamideCompound 14

5-[(6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl](2-pyridyl))amino]-N- methylpentanamide Compound15

(6-[(4-carbamoylbutyl)amino]-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamideCompound 16

4-[(6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl](2-pyridyl))amino]-N,N- dimethylbutanamideCompound 17

(6-[(3-carbamoylpropyl)amino]-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamideCompound 18

(6-(dimethylamino)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide Compound 19

5-[(6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl](2-pyridyl))amino]-N-(3-pyridylmethyl)pentanamide Compound 20

(2-{[2-(3-fluorophenyl)ethyl]amino}-6-(methylamino)(3-pyridyl))-N-(3-pyridylmethyl)carboxamide Compound 21

N-(6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl](2-pyridyl))-N-methylacetamide Compound 22

N-(6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl](2-pyridyl))-N-(2- hydroxyethyl)acetamideCompound 23

6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl]pyridine-2-carboxamide Compound 24

(6-cyano-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide Compound 25

(2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(3-pyridylmethyl)amino](3-pyridyl))-N-(3- pyridylmethyl)carboxamideCompound 26

(6-[(cyanoamino)iminomethyl]-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamideCompound 27

(6-((1Z)-1-methylprop-1-enyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamideCompound 28

(2-{[2-(3-fluorophenyl)ethyl]amino}-6-(N-methylcarbamoyl)(3-pyridyl))-N-(3- pyridylmethyl)carboxamide Compound 29

methyl 6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl]pyridine-2-carboxylate Compound 30

(2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(2-pyridylmethyl)amino](3-pyridyl))-N-(3- pyridylmethyl)carboxamideCompound 31

(6-((1E)prop-1-enyl)-5-bromo-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamideCompound 32

methyl (2E)-3-(6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl](2-pyridyl))but-2-enoate Compound 33

(2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(4-pyridylmethyl)amino](3-pyridyl))-N-(3- pyridylmethyl)carboxamideCompound 34

ethyl 6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl]pyridine-2-carboxylate Compound 35

(6-((1E)prop-1-enyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide Compound 36

(6-((1E)prop-1-enyl)-5-cyano-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamideCompound 37

(2-{[2-(3-fluorophenyl)ethyl]amino}-6-(2-methylprop-1-enyl)(3-pyridyl))-N-(3-pyridylmethyl)carboxamide Compound 38

(6-[(dimethylamino)iminomethyl]-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamideCompound 39

(6-[(1E)-1-(dimethylamino)-2-cyano-2-azavinyl]-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamideCompound 40

6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl]pyridine-2-carboxamidine Compound 41

2-[(2-{[2-(3-fluorophenyl)ethyl]amino}-5-phenyl(3-pyridyl))carbonylamino]-N-methylacetamide Compound 42

(6-((1E)prop-1-enyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-{[2-(aminomethyl)(3- pyridyl)]methyl}carboxamide boc

2-[(5-(2-cyanophenyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))carbonylamino]-N-methylacetamide Compound 43

(6-((1E)-3-methoxyprop-1-enyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamideCompound 44

(6-(ethoxyethyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide Compound 45

(6-acetyl-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide Compound 46

(6-((1E)prop-1-enyl)-5-fluoro-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-{[2-(aminomethyl)(3-pyridyl)]methyl}carboxamide Compound 47

(6-((1E)prop-1-enyl)-5-fluoro-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-[(2-{[(tert-butoxy)carbonylamino]methyl}(3- pyridyl)methyl]carboxamide Compound 48

N-{[2-(aminomethyl)(3-pyridyl)]methyl}(5-fluoro-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))carboxamide Compound 49

(2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide Compound 50

(6-(1,2-dimethylprop-1-enyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamideCompound 51

(2-{[2-(3-fluorophenyl)ethyl]amino}-6-(3-methoxypropyl)(3-pyridyl))-N-(3-pyridylmethyl)carboxamide Compound 52

(6-(1-ethoxyvinyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide Compound 53

(2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(2-hydroxyethyl)amino](3-pyridyl))-N-(3- pyridylmethyl)carboxamide Compound54

(2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(2-hydroxyethyl)methylamino](3-pyridyl))-N-(3- pyridylmethyl)carboxamideCompound 55

(2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(2-methoxyethyl)amino](3-pyridyl))-N-(3- pyridylmethyl)carboxamide Compound56

(2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(2-hydroxypropyl)methylamino](3-pyridyl))-N-(3- pyridylmethyl)carboxamideCompound 57

(2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(3-methoxypropyl)amino](3-pyridyl))-N-(3- pyridylmethyl)carboxamideCompound 58

(2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(3-hydroxypropyl)amino](3-pyridyl))-N-(3- pyridylmethyl)carboxamide

The compounds described herein can be synthesized utilizing techniqueswell known in the art from commercially available starting materials andreagents. For example, the compounds described herein can be prepared asshown below.

Unless specified to the contrary, for each gram of the limiting reagent,one cc (or mL) of solvent constitutes a volume equivalent.

Isolation and purification of the compounds and intermediates describedherein can be effected, if desired, by any suitable separation orpurification procedure such as, for example, filtration, extraction,crystallization, column chromatography, thin-layer chromatography orthick-layer chromatography, or a combination of these procedures.Specific illustrations of suitable separation and isolation proceduresare provided in the Example. However, other equivalent separation orisolation procedures can, of course, also be used.

When desired, the (R) and (S) isomers may be resolved by methods knownto those skilled in the art, for example by formation ofdiastereoisomeric salts or complexes which may be separated, forexample, by crystallization; via formation of diastereoisomericderivatives which may be separated, for example, by crystallization,gas-liquid or liquid chromatography; selective reaction of oneenantiomer with an enantiomer-specific reagent, for example enzymaticoxidation or reduction, followed by separation of the modified andunmodified enantiomers; or gas-liquid or liquid chromatography in achiral environment, for example on a chiral support, such as silica witha bound chiral ligand or in the presence of a chiral solvent. It will beappreciated that when the desired enantiomer is converted into anotherchemical entity by one of the separation procedures described above, afurther step may be required to liberate the desired enantiomeric form.Alternatively, a specific enantiomer may be synthesized by asymmetricsynthesis using optically active reagents, substrates, catalysts and/orsolvents, or by converting one enantiomer to the other by asymmetrictransformation.

The chemical entities described herein may be useful in a variety ofapplications involving smooth muscle cells and/or non-muscle cells. Incertain embodiments, the chemical entities may be used to inhibit smoothmuscle myosin. The chemical entities may be useful to bind to, and/orinhibit the activity of, smooth muscle myosin. In certain embodiments,the smooth muscle myosin is human, although the chemical entities may beused to bind to or inhibit the activity of smooth muscle myosin fromother organisms, such as other mammals.

In certain embodiments, the chemical entities may be used to inhibitnon-muscle myosin. The chemical entities may be useful to bind to,and/or inhibit the activity of, non-muscle myosin. In certainembodiments, the non-muscle myosin is human, although the chemicalentities may be used to bind to or inhibit the activity of non-musclemyosin from other organisms, such as other mammals.

The chemical entities described herein may be used to treat diseasestates associated with smooth muscle and/or non-muscle myosin. Suchdisease states which can be treated by the chemical entities describedherein include, but are not limited to, hypertension, asthma,incontinence, chronic obstructive pulmonary disorder, pre-term labor,and the like. It is appreciated that in some cases the cells may not bein an abnormal state and still require treatment. Thus, in certainembodiments, the chemical entities described herein can be applied tocells or administered to individuals afflicted or subject to impendingaffliction with any one of these disorders or states.

More specifically, the chemical entities described herein may be usefulfor the treatment of diseases or symptoms related to abnormal increasedmuscle tone or excessive contraction, or spasm of vascular smooth musclein systemic, coronary, pulmonary circulation, and micro-circulatorysmooth muscle as well, such as systemic hypertension, malignanthypertension, hypertension crisis, symptomatic hypertension, pulmonaryhypertension, pulmonary infarction, angina pectoris, cardiac infarction,micro-circulation malfunction under shock condition, and infarctionoccurred in other location or organs of the human or animal body. Otherdiseases or symptoms that can be treated with the chemical entitiesdescribed herein include:

-   -   spasm of gastro-intestine smooth muscle, including sphincters,        such as gastric spasm, pylorospasm, and spasms of biliary tract,        pancreatic tract, urinary tract, caused by inflammation,        stimulation of stones or parasites;    -   spasm of other visceral organs such as uterus, Fallopian tube,        and so on;

spasm of trachea-bronchial tree smooth muscle, diaphragm muscle, such asvarious asthma, breathlessness, dyspnea, diaphragmatic convulsion, andso on;

-   -   spasm of alimentary canal smooth muscle, including stomach,        intestine and colons, biliary and pancreatic duct etc.; and    -   spasm of urinary tract smooth muscle.

In addition, the chemical entities described herein can be used forcontrol, management and manipulation of labor during pregnancy. Themethod is particularly useful for inhibition of spontaneous pretermlabor which would, if untreated, result in premature delivery orabortion and for inhibition of surgically induced labor duringtransuterine fetal surgery. The method is also useful for inducing thelabor in overterm pregnancies where the labor does not occur on term andwhen it is necessary to induce labor in order to assure the normaldelivery.

Further, the chemical entities described herein can be used for thetreatment of “airway wall remodeling”, which is a condition associatedwith diseases or conditions characterized by airway wall thickening andair obstruction, which may, for example occur in the small airways ofpatients with certain respiratory disease conditions, such as, chronicobstructive pulmonary disease (COPD).

Such disease states which can be treated by the chemical entities,compositions and methods provided herein also include, but are notlimited to glaucoma and other ocular indications. More specifically,chemical entities described herein may be useful for the treatment ofdiseases or symptoms related to glaucoma, including increasedintraocular pressure, reduced flow of intraocular aqueous humor, andoptical nerve damage. Other diseases or symptoms that can be treatedwith the chemical entities, compositions, and methods described hereinincluding intraocular hypertenstion.

ATP hydrolysis is employed by myosin to produce force. An increase inATP hydrolysis would correspond to an increase in the force or velocityof muscle contraction. In the presence of actin, myosin ATPase activityis stimulated more than 100-fold. Thus, the measurement of ATPhydrolysis not only measures myosin enzymatic activity but also itsinteraction with the actin filament. Assays for such activity may employsmooth muscle myosin from a human source, although myosin from otherorganisms can also be used. Systems that model the regulatory role ofcalcium in myosin binding may also be used.

The in vitro rate of ATP hydrolysis correlates to smooth muscle myosinpotentiating activity, which can be determined by monitoring theproduction of either ADP or phosphate, for example as described in U.S.Pat. No. 6,410,254. ADP production can also be monitored by coupling theADP production to NADH oxidation (using, for example, the enzymespyruvate kinase and lactate dehydrogenase) and monitoring the NADHlevel, by example, either by absorbance or fluorescence (Greengard, P.,Nature 178 (Part 4534): 632-634 (1956); Mol Pharmacol 1970 January;6(1):31-40). Phosphate production can be monitored using purinenucleoside phosphorylase to couple phosphate production to the cleavageof a purine analog, which results in either a change in absorbance (ProcNatl Acad Sci USA 1992 June 1; 89(11):4884-7) or fluorescence (Biochem J1990 March 1; 266(2):611-4). While a single measurement is employed,multiple measurements of the same sample at different times in order maybe used to determine the absolute rate of the protein activity; suchmeasurements have higher specificity particularly in the presence oftest compounds that have similar absorbance or fluorescence propertieswith those of the enzymatic readout.

Test compounds may be assayed in a highly parallel fashion usingmultiwell plates by placing the compounds either individually in wellsor testing them in mixtures. Assay components including the targetprotein complex, coupling enzymes and substrates, and ATP may then beadded to the wells and the absorbance or fluorescence of each well ofthe plate can be measured with a plate reader.

One method uses a 384 well plate format and a 25 μL reaction volume. Apyruvate kinase/lactate dehydrogenase coupled enzyme system (Huang T Gand Hackney DD. (1994) J Biol Chem 269(23):16493-16501) is used tomeasure the rate of ATP hydrolysis in each well. As will be appreciatedby those of skill in the art, the assay components are added in buffersand reagents. Since the methods outlined herein allow kineticmeasurements, incubation periods may be optimized to give adequatedetection signals over the background. The assay is performed in realtime to give the kinetics of ATP hydrolysis to increase thesignal-to-noise ratio of the assay.

Selectivity for smooth muscle myosin may be determined by substitutingother myosins in one or more of the above-described assays and comparingthe results obtained against those obtained using the cardiacequivalents.

Chemical entities identified by the methods described herein as smoothmuscle myosin modulators may be further tested in an efficacy screen,such as a screen using strips of permeabilized smooth muscle from, e.g.,chicken gizzard. Calcium-sensitive smooth muscle strips are prepared bydissecting chicken gizzard tissue, followed by treatment with 1% TritonX-100 to make the strips permeable to exogenous compounds (Barsotti, RJ, et al., Am J Physiol. 1987 May; 252(5 Pt 1):C543-54). These stripscan be stored in 50% glycerol for several weeks at −20° C., allowingmultiple experiments to be performed with each batch of muscle strips.Experiments are performed using a solution of 20 mM imidazole pH 7.0,5.5 mM ATP, 7 mM MgCl₂, 55 mM KCl, 1 μM Calmodulin, and 10 mM EGTA. Freecalcium will be controlled by addition of various amounts of CaCl₂,according to the calculations of MAXChelator (Patton, et al. CellCalcium. 35/5 pp. 427-431, 2004). An isometric muscle fiber apparatus isused to measure isometric tension, for example using an AuroraScientific 400A transducer with National Instruments PCI-MIO-16E-4, 16channels, 12 bit A/D board for data acquisition. The chemically skinnedgizzard fibers are relaxed when bathed in low calcium solutions (pCa 8),but develop isometric tension when the free calcium of the bathingsolution is increased to pCa 5. These fibers can be repeatedlycontracted and relaxed by switching between high and low calcium bathingsolutions.

Compounds are first tested for their ability to prevent contraction ofgizzard strips, by preincubating relaxed fibers with a compound,followed by transfer to high calcium solution containing the compound.Next, compounds are tested for their ability to cause relaxation ofcontracting fibers by adding the compound to fibers already incubatingin high calcium solution. Washout experiments are performed to ensurethat the inhibitory effects are reversible, so that the compounds do notcause denaturation or other irreparable damage to the smooth musclemyosin.

The chemical entities are administered at a therapeutically effectivedosage, e.g., a dosage sufficient to provide treatment of the diseasestates previously described. Generally, a daily dose is from about 0.05to about 100 mg/kg of body weight, such as from about 0.10 to about 10mg/kg of body weight or from about 0.15 to about 1 mg/kg of body weight.Thus, for administration to a 70 kg person, the dosage range is fromabout 3.5 to about 7000 mg per day, such as from about 7 to about 700 mgper day or from about 10 to about 100 mg per day. The amount of activechemical entity administered will, of course, be dependent on thesubject and disease state being treated, the severity of the affliction,the manner and schedule of administration and the judgment of theprescribing physician; for example, a dose range for oral administrationmay be from about 70 to about 700 mg per day, whereas for intravenousadministration the dose range may be from about 700 to about 7000 mg perday. The active agents may be selected for longer or shorter plasmahalf-lives, respectively.

Administration of the chemical entities described herein includingpharmaceutically acceptable salts thereof can be via any of the acceptedmodes of administration for agents that serve similar utilitiesincluding, but not limited to, orally, subcutaneously, intravenously,intranasally, topically, transdermally, sublingually, intramucosally,intraperitoneally, intramuscularly, intrapulmonarilly, vaginally,rectally, and intraocularly (including intraocular injection). Oral,topical, parenteral, and intraocular administration are customary intreating many of the indications recited herein.

Pharmaceutically acceptable compositions include solid, semi-solid,liquid and aerosol dosage forms, such as, e.g., tablets, capsules,powders, liquids, suspensions, suppositories, aerosols, and the like.The chemical entities can also be administered in sustained- orcontrolled-release dosage forms, including depot injections, osmoticpumps, pills, transdermal (including electrotransport) patches, dropsand the like, for prolonged and/or timed, pulsed administration at apredetermined rate. The compositions may be provided in unit dosageforms suitable for single administration of a precise dose.

The chemical entities may be administered either alone or in combinationwith a conventional pharmaceutical carrier or the like (e.g., mannitol,lactose, starch, magnesium stearate, sodium saccharine, talcum,cellulose, sodium crosscarmellose, glucose, gelatin, sucrose, magnesiumcarbonate, and the like). If desired, the pharmaceutical composition mayalso contain minor amounts of nontoxic auxiliary substances such aswetting agents, emulsifying agents, solubilizing agents, pH bufferingagents and the like (e.g., sodium acetate, sodium citrate, cyclodextrinederivatives, sorbitan monolaurate, triethanolamine acetate,triethanolamine oleate. Generally, depending on the intended mode ofadministration, the pharmaceutical composition may contain from about0.005% to about 95%, for example, from about 0.5% to about 50%, byweight of at least one chemical entity described herein. Actual methodsof preparing such dosage forms are known or will be apparent, to thoseskilled in this art; for example, see Remington's PharmaceuticalSciences, Mack Publishing Company, Easton, Pa. Pharmaceuticalcompositions are also referred to as pharmaceutical formulations.

In addition, the chemical entities may be co-administered with, and thepharmaceutical compositions can include, other medicinal agents,pharmaceutical agents, adjuvants, and the like.

In certain embodiments, the compositions are in the form of a pill ortablet and contain, along with the active ingredient, one or more of adiluent such as lactose, sucrose, dicalcium phosphate, and the like; alubricant such as magnesium stearate or the like; and a binder such asstarch, gum acacia, polyvinylpyrrolidine, gelatin, cellulose, cellulosederivatives and the like. In another solid dosage form, a powder,marume, solution or suspension (e.g., in propylene carbonate, vegetableoils or triglycerides) may be encapsulated in a gelatin capsule.

Liquid pharmaceutical compositions may, for example, be prepared bydissolving, dispersing, etc. at least one chemical entity and one ormore optional pharmaceutical adjuvants in a carrier (e.g., water,saline, aqueous dextrose, glycerol, glycols, ethanol and the like) toform a solution or suspension. Injectables may be prepared inconventional forms, either as liquid solutions or suspensions, asemulsions, or in solid forms suitable for dissolution or suspension inliquid prior to injection. The percentage of chemical entities containedin such parenteral compositions is highly dependent on the specificnature thereof, as well as the activity of the chemical entities and theneeds of the subject. However, percentages of active ingredient rangingfrom about 0.01% to about 10% in solution may be used, and may be higherif the composition is a solid which will be subsequently diluted to theabove percentages. In certain embodiments, the composition has fromabout 0.2% to about 2% of the active agent in solution.

Compositions comprising at least one chemical entity may be administeredintraocularly (including intraocular, periocular, and retrobulbarinjection and perfusion). When adminsitered intraocularly the sterilecomposition is typically aqueous. An appropriate buffer system may beadded to prevent pH drift under storage conditions. When administeredduring intraocular surgical procedures, such as retrobulbar orperiocular injection and intraocular perfusion or injection, the use ofbalanced salt irrigating solutions may be necessary. When used in amultidose form, preservatives may be required to prevent microbialcontamination during use.

Compositions comprising at least one chemical entity may also beadministered topically as eye drops, eye wash, creams, ointments, gels,and sprays. When administered as eye drops or eye wash, the activeingredients are typically dissolved or suspended in suitable carrier,typically a sterile aqueous solvent. An appropriate buffer system may beadded to prevent pH drift under storage conditions. When used in amultidose form, preservatives may be required to prevent microbialcontamination during use.

Compositions comprising at least one chemical entity may also beadministered to the respiratory tract as an aerosol or in a solution fora nebulizer, or as a microfine powder for insufflation, alone or incombination with an inert carrier such as lactose. The particles of thecomposition typically have diameters of less than 50 microns, forexample, less than 10 microns.

Generally, to employ the chemical entities described herein in methodsof screening for smooth muscle myosin binding, smooth muscle myosin isbound to a support and at least one chemical entity is added to theassay. Alternatively, the chemical entity may be bound to the supportand the smooth muscle myosin added. Classes of compounds among whichnovel binding agents may be sought include specific antibodies,non-natural binding agents identified in screens of chemical libraries,peptide analogs, etc. Of particular interest are screening assays forcandidate agents that have a low toxicity for human cells. A widevariety of assays may be used for this purpose, including labeled invitro protein-protein binding assays, electrophoretic mobility shiftassays, immunoassays for protein binding, functional assays(phosphorylation assays, etc.), and the like. See, e.g., U.S. Pat. No.6,495,337.

EXAMPLES

The following examples serve to more fully describe the manner of usingthe invention. These examples are presented for illustrative purposesand should not serve to limit the true scope of the invention.

Example I

(E)-2-(3-fluorophenethylamino)-6-(prop-1-enyl)-N-(pyridin-3-ylmethyl)nicotinamide

A mixture of acid 2,6-dichloronicotinic acid (19.2 g, 0.1 mol),N,N′-carbonyldiimidazole (CDI, 17.8 g, 0.11 mmol) and THF (1 L) wasstirred at 60° C. for 30 min and cooled to room temperature. To themixture was added 3-aminomethylpyridine (10.2 mL, 0.1 mol) and DIEA (21mL, 0.12 mol). The reaction mixture was stirred at room temperature for4 hrs, and diluted with EtOAc. The organic layer was washed with H₂O,brine, dried over Na₂SO₄. Concentration of the organic solution gave the2,6-dichloro-N-(pyridin-3-ylmethyl)nicotinamide (20.5 g, 73%). LRMS(M+H⁺) m/z 282.0; (M+2+H⁺) m/z 283.9.

A mixture of chloride 2,6-dichloro-N-(pyridin-3-ylmethyl)nicotinamide(20.4 g, 72.3 mmol), 3-fluorophenethyl amine (11.1 g, 79.5 mmol), K₂CO₃(20 g 145 mmol) and DMF (200 mL) was stirred at 10° C. for 10 hours. Themixture was diluted with ethyl acetate (2×300 mL) and washed withsaturated ammonium chloride, sodium bicarbonate and brine. The organiclayers were combined, dried (MgSO₄) and concentrated. The residue waspurified by silica gel chromatography to give the desired product6-chloro-2-(3-fluorophenethylamino)-N-(pyridin-3-ylmethyl)nicotinamide(12.6 g, 46%). LRMS (M+H⁺) m/z 385.1.

A mixture of chloride6-chloro-2-(3-fluorophenethylamino)-N-(pyridin-3-ylmethyl)nicotinamide(100 mg, 0.260 mmol), trans-1-propen-1-yl boronic acid (27 mg, 0.312mmol), PdCl₂(dppf)₂ (14 mg, 0.026 mmol), 2N K₂CO₃(0.39 mL, 0.78 mmol)and THF (1.5 mL) was stirred at 125° C. for 30 min. The mixture wasfiltered through the silica gel pad and washed with EtOAc. The filtratewas concentrated to dryness and purified on RP-HPLC using a mixture ofacetonitrile and H₂O to give(E)-2-(3-fluorophenethylamino)-6-(prop-1-enyl)-N-(pyridin-3-ylmethyl)nicotinamideas a pale yellow solid (59 mg, 86%). LRMS (M+H⁺) m/z 391.2.

Example II

2-(3-fluorophenethylamino)-6-(cyanoimidamide)-N-(pyridine-3-ylmethyl)nicotinamide

A mixture of6-chloro-2-(3-fluorophenethylamino)-N-(pyridin-3-ylmethyl)nicotinamide(1.3 g, 3.3 mmol), NiBr₂ (1.1 g, 4.9 mmol), NaCN (0.48 g, 9.8 mmol) andNMP (6 mL) was stirred at 220° C. for 1 hour. The reaction mixture wasfiltered through Celite with EtOAc. The organics were washed with water,brine, dried (Na₂SO₄) and concentrated to give the nitrile6-cyano-2-(3-fluorophenethylamino)-N-(pyridin-3-ylmethyl)nicotinamide(0.85 g, 69%). LC/MS (M+H⁺) m/z 376.1.

A three neck round bottom flask fixed with a dry ice acetone condenserwas charged with the nitrile nitrile6-cyano-2-(3-fluorophenethylamino)-N-(pyridin-3-ylmethyl)nicotinamide(0.10 g, 0.27 mmol), EtOH (2 mL) and stirred with HCl_((g)) for 20minutes. The reaction mixture was then concentrated to dryness to givethe ethyl6-(3-fluorophenethylamino)-5-(pyridin-3-ylmethylcarbamoyl)picolinimidate.LC/MS (M+H⁺) m/z 422.1.

A mixture of the ethyl6-(3-fluorophenethylamino)-5-(pyridin-3-ylmethylcarbamoyl)picolinimidateand NH₃/MeOH (7N, 0.76 mL) was stirred at 50° C. for 1 hour. Thereaction mixture was concentrated to dryness to give6-carbamimidoyl-2-(3-fluorophenethylamino)-N-(pyridin-3-ylmethyl)nicotinamide.LC/MS (M+H⁺) m/z 394.1.

A mixture of6-carbamimidoyl-2-(3-fluorophenethylamino)-N-(pyridin-3-ylmethyl)nicotinamide(0.013 g, 0.034 mmol), CNBr (3N, 0.017 mL, 0.051 mmol), DIPEA (0.0085mL, 0.051 mmol), in DCM (0.10 mL) was stirred at room temperature untilthe reaction was complete. The reaction mixture was concentrated todryness and purified by RP-HPLC using a mixture of acetonitrile and H₂Oto give6-(N-cyanocarbamimidoyl)-2-(3-fluorophenethylamino)-N-(pyridin-3-ylmethyl)nicotinamideas a solid (0.0058 g, 41%). LC/MS (M+H⁺) m/z 418.1.

Example III

Using procedures similar to those described herein, the compounds in thefollowing table were synthesized and tested.

IC50 Arithmetic Mean Ion m/z CHEMICAL NAME 7.3929 M + H 457.1N-{[6-(aminomethyl)(2-pyridyl)]methyl}(2-{[2-(3-fluorophenyl)ethyl]amino}-5-(3-pyridyl)(3- pyridyl))carboxamide 9.8364M + H 457.1 N-{[6-(aminomethyl)(2-pyridyl)]methyl}(2-{[2-(3-fluorophenyl)ethyl]amino}-5-(4-pyridyl)(3- pyridyl))carboxamide 17.7374M + H 460.1 N-{[6-(aminomethyl)(2-pyridyl)]methyl}(2-{[2-(3-fluorophenyl)ethyl]amino}-5-(1-methylpyrazol-4-yl)(3-pyridyl))carboxamide 6.0282 M + H 481.1N-{[6-(aminomethyl)(2-pyridyl)]methyl}(5-(2-cyanophenyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3- pyridyl))carboxamide12.683 M + H 376.1 (5-cyano-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(2-pyridylmethyl)carboxamide 17.7243 M + H 445(5-bromo-2-{[2-(3-fluorophenyl)ethyl]amino}(3- pyridyl))-N-[(6-methyl(2-pyridyl))methyl]carboxamide 17.258 M + H 465 (5-bromo-6-chloro-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(2- pyridylmethyl)carboxamide11.19 M + H 341 5-bromo-2-{[2-(3-fluorophenyl)ethyl]amino}pyridine-3-carboxylic acid 14.887 M + H 300.1methyl 5-cyano-2-{[2-(3- fluorophenyl)ethyl]amino}pyridine-3-carboxylate9.7159 M + H 590 N-({6-[(1,3-dioxobenzo[c]azolin-2-yl)methyl](2-pyridyl)}methyl)(5-bromo-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))carboxamide 11.8154 M + H 431(5-bromo-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(2-pyridylmethyl)carboxamide 15.0424 M + H 460N-{[6-(aminomethyl)(2-pyridyl)]methyl}(5-bromo-2-{[2-(3-fluorophenyl)ethyl]amino}(3- pyridyl))carboxamide 16.0219 M + H457.1 N-{[6-(aminomethyl)(2-pyridyl)]methyl}(2-{[2-(3-fluorophenyl)ethyl]amino}-5-(2-pyridyl)(3- pyridyl))carboxamide 44.3072M + H 389.2 methyl 6-[(4-carbamoylbutyl)amino]-2-{[2-(3-fluorophenyl)ethyl]amino}pyridine-3-carboxylate 55.0688 M + H 493.25-[(6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl](2-pyridyl))amino]-N,N- dimethylpentanamide38.046 M + H 479.2 5-[(6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl](2-pyridyl))amino]-N- methylpentanamide 6.7378M + H 465.2 (6-[(4-carbamoylbutyl)amino]-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamide70.3134 M + H 479.2 4-[(6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl](2-pyridyl))amino]-N,N- dimethylbutanamide42.7772 M + H 451.2 (6-[(3-carbamoylpropyl)amino]-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamide4.919 M + H 394.1 (6-(dimethylamino)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamide49.2162 M + H 556.2 5-[(6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl](2-pyridyl))amino]-N-(3-pyridylmethyl)pentanamide 10.883 M + H 380.2(2-{[2-(3-fluorophenyl)ethyl]amino}-6- (methylamino)(3-pyridyl))-N-(3-pyridylmethyl)carboxamide 33.5035 M + H 422.2N-(6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl](2-pyridyl))-N- methylacetamide 53.412 M + H452.2 N-(6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl](2-pyridyl))-N-(2- hydroxyethyl)acetamide13.9674 M + H 394.1 6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl]pyridine-2-carboxamide 65.8061 M + H 376.1(6-cyano-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide 5.6092 M + H 457.1(2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(3-pyridylmethyl)amino](3-pyridyl))-N-(3- pyridylmethyl)carboxamide 0.2309M + H 418.1 (6-[(cyanoamino)iminomethyl]-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamide10.5082 M + H 405.1 (6-((1Z)-1-methylprop-1-enyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamide44.1181 M + H 408.1 (2-{[2-(3-fluorophenyl)ethyl]amino}-6-(N-methylcarbamoyl)(3-pyridyl))-N-(3- pyridylmethyl)carboxamide 4.3507 M +H 409.1 methyl 6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl]pyridine-2-carboxylate 10.7731 M + H 457.2(2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(2-pyridylmethyl)amino](3-pyridyl))-N-(3- pyridylmethyl)carboxamide 0.7796M + H 469 (6-((1E)prop-1-enyl)-5-bromo-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamide3.4457 M + H 449.1 methyl (2E)-3-(6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl](2-pyridyl))but-2- enoate 33.9795 M + H457.1 (2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(4-pyridylmethyl)amino](3-pyridyl))-N-(3- pyridylmethyl)carboxamide 2.6522M + H 423.1 ethyl 6-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl]pyridine-2-carboxylate 0.3021 M + H 391.2(6-((1E)prop-1-enyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamide0.3608 M + H 416.1 (6-((1E)prop-1-enyl)-5-cyano-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamide0.3473 M + H 405.2 (2-{[2-(3-fluorophenyl)ethyl]amino}-6-(2-methylprop-1-enyl)(3-pyridyl))-N-(3- pyridylmethyl)carboxamide 17.2629M + H 421.2 (6-[(dimethylamino)iminomethyl]-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamide5.1875 M + H 446.1 (6-[(1E)-1-(dimethylamino)-2-cyano-2-azavinyl]-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide 6.619 M + H 393.16-{[2-(3-fluorophenyl)ethyl]amino}-5-[N-(3-pyridylmethyl)carbamoyl]pyridine-2-carboxamidine 14.9996 M + H 407.12-[(2-{[2-(3-fluorophenyl)ethyl]amino}-5-phenyl(3-pyridyl))carbonylamino]-N-methylacetamide 0.038 M + H 420.1(6-((1E)prop-1-enyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-{[2-(aminomethyl)(3-pyridyl)]methyl}carboxamide 17.9719 M + H 432.12-[(5-(2-cyanophenyl)-2-{[2-(3- fluorophenyl)ethyl]amino}(3-pyridyl))carbonylamino]-N-methylacetamide 0.9273 M + H 421.2(6-((1E)-3-methoxyprop-1-enyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamide73.03 M + H 423.2 (6-(ethoxyethyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamide24.7905 M + H 393.1 (6-acetyl-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide 0.0805 M + H 438.1(6-((1E)prop-1-enyl)-5-fluoro-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-{[2-(aminomethyl)(3-pyridyl)]methyl}carboxamide 11.7073 M + H 538.2(6-((1E)prop-1-enyl)-5-fluoro-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-[(2-{[(tert-butoxy)carbonylamino]methyl}(3- pyridyl))methyl]carboxamide 2.6897 M + H398 N-{[2-(aminomethyl)(3-pyridyl)]methyl}(5-fluoro-2-{[2-(3-fluorophenyl)ethyl]amino}(3- pyridyl))carboxamide 26.8336 M + H351.1 (2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide 2.7696 M + H 419.2(6-(1,2-dimethylprop-1-enyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamide8.1803 M + H 423.1 (2-{[2-(3-fluorophenyl)ethyl]amino}-6-(3-methoxypropyl)(3-pyridyl))-N-(3- pyridylmethyl)carboxamide 0.7025 M + H421.2 (6-(1-ethoxyvinyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3- pyridylmethyl)carboxamide13.0601 M + H 410.2 (2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(2-hydroxyethyl)amino](3-pyridyl))-N-(3- pyridylmethyl)carboxamide 45.4109M + H 424.2 (2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(2-hydroxyethyl)methylamino](3-pyridyl))-N-(3- pyridylmethyl)carboxamide7.6223 M + H 424.2 (2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(2-methoxyethyl)amino](3-pyridyl))-N-(3- pyridylmethyl)carboxamide 10.4821M + H 438.2 (2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(2-hydroxypropyl)methylamino](3-pyridyl))-N-(3- pyridylmethyl)carboxamide11.0022 M + H 438.2 (2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(3-methoxypropyl)amino](3-pyridyl))-N-(3- pyridylmethyl)carboxamide 8.4659M + H 424.2 (2-{[2-(3-fluorophenyl)ethyl]amino}-6-[(3-hydroxypropyl)amino](3-pyridyl))-N-(3- pyridylmethyl)carboxamide

Example IV In Vitro Model of Dose Dependent Smooth Muscle Myosin ATPaseModulation

Screening assays were performed using a pyruvate kinase and lactatedehydrogenase-coupled ATPase assay containing the following reagents:Potassium PIPES (50 mM), MgCl₂ (3 mM), KCl (100 mM), ATP (0.15 mM), DTT(1 mM), BSA (0.1 mg/ml), NADH (0.5 mM), PEP (1.5 mM), pyruvate kinase (4U/ml), lactate dehydrogenase (8 U/ml), and antifoam (50 ppm)(concentrations expressed are final assay concentrations). The pH wasadjusted to 6.80 at 22□ C by addition of potassium hydroxide. Leadoptimization assays were performed with a more sensitive pyruvatekinase/horseradish peroxidase/pyruvate oxidase-coupled ATPase assaycontaining the following reagents: Potassium PIPES (12 mM), MgCl₂ (2mM), KCl (100 mM), ATP (0.15 mM), BSA (0.05 mg/ml), potassium phosphate(2 mM), amplex red (0.1 mM), PEP (0.1 mM), pyruvate kinase (4 U/ml),horseradish peroxidase (0.5 U/ml), pyruvate oxidase (0.5 U/ml), andantifoam (50 ppm) (concentrations expressed are final assayconcentrations). The pH was adjusted to 7.00 at 22□ C by addition ofpotassium hydroxide.

The protein components specific to this assay are chicken gizzard smoothmuscle myosin subfragment-1 that has been chemically crosslinked toeither cardiac or skeletal actin using an excess of1-Ethyl-3-[3-dimethylaminopropyl]carbodiimide hydrochloride andN-hydroxysuccinimide. The exact concentration of the crosslinked smoothmuscle myosin in the assay is determined empirically, by titration toachieve a desired rate of ATP hydrolysis. The concentration variesbetween protein preparations due to variations in the fraction of activemolecules in each preparation.

Compound dose response assays are performed by first preparing adilution series of test compound, each with an assay mixture containingpotassium PIPES, MgCl₂, KCl, ATP, BSA, potassium phosphate, amplex red,PEP, crosslinked smooth muscle actomyosin (subfragment-1), antifoam, andwater. The assay is started by adding an equal volume of solutioncontaining potassium Pipes, MgCl₂, KCl, BSA, potassium phosphate,pyruvate kinase, horseradish peroxidase, pyruvate oxidase, antifoam, andwater. ATP hydrolysis is monitored by measuring the fluorescence ofamplex red (excitation at 480 nm, emission at 615 nm). The resultingdose response curve is fit by the 4 parameter equationy=Bottom+((Top-Bottom)/(1+((IC₅₀/X)^Hill))). The IC₅₀ is defined as theconcentration at which ATPase activity is midway between the top andbottom of the dose response curve.

Certain chemical entities described herein have an IC₅₀ less than 10 μM;for example, less than 1 μM.

While the present invention has been described with reference to thespecific embodiments thereof, it should be understood by those skilledin the art that various changes may be made and equivalents may besubstituted without departing from the true spirit and scope of theinvention. In addition, many modifications may be made to adapt aparticular situation, material, composition of matter, process, processstep or steps, to the objective, spirit and scope of the presentinvention. All such modifications are intended to be within the scope ofthe claims appended hereto.

1. A compound of Formula I

or a pharmaceutically acceptable salt thereof wherein R¹ and R⁴ areindependently chosen from hydrogen, cyano, halo, and alkyl; Z¹ is chosenfrom substituted alkyl, optionally substituted alkenyl, and optionallysubstituted alkynyl; Z² is —C(O)NR²R⁵ wherein R² is optionallysubstituted alkyl, and R⁵ is chosen from hydrogen and alkyl; Z³ isoptionally substituted alkyl; and R³ is chosen from hydrogen and alkyl.2. The compound of claim 1 wherein R³ is chosen from hydrogen andmethyl.
 3. The compound of claim 2 wherein R³ is hydrogen.
 4. Thecompound of claim 1 wherein R⁴ is chosen from hydrogen, cyano, chloro,bromo, fluoro, and methyl.
 5. The compound of claim 1 wherein R⁴ ishydrogen.
 6. The compound of claim 1 wherein R⁵ is chosen from hydrogenand methyl.
 7. The compound of claim 6 wherein R⁵ is hydrogen.
 8. Thecompound of claim 1 wherein R² is chosen from optionally substitutedmethyl, optionally substituted ethyl, optionally substituted propyl,optionally substituted butyl, optionally substituted pentyl, andoptionally substituted hexyl, wherein each optionally substituted groupis optionally substituted with one, two or three groups selected fromoptionally substituted aryl, optionally substituted heteroaryl,optionally substituted heterocycloalkyl, optionally substitutedcycloalkyl, optionally substituted aminocarbonyl, optionally substitutedamino, hydroxy, carboxyl, optionally substituted alkoxycarbonyl, andoptionally substituted alkoxy.
 9. The compound of claim 8 wherein R² ischosen from methyl and ethyl, wherein the methyl and ethyl groups areoptionally substituted with one or two groups selected from optionallysubstituted aryl, optionally substituted heteroaryl, optionallysubstituted heterocycloalkyl, optionally substituted cycloalkyl,optionally substituted aminocarbonyl, optionally substituted amino,hydroxy, carboxyl, optionally substituted alkoxycarbonyl, and optionallysubstituted alkoxy.
 10. The compound of claim 9 wherein R² is chosenfrom (1-(2-aminoethyl)-1H-pyrazol-3-yl)methyl;(1-(methylsulfonyl)piperidin-3-yl)methyl;(1-acetylpiperidin-3-yl)methyl; (1-acetylpyrrolidin-2-yl) methyl;(1H-imidazol-2-yl)methyl; (1H-pyrazol-3-yl)methyl;(1-methyl-1H-pyrazol-3-yl) methyl; (1-methyl-1H-pyrazol-5-yl)methyl;(2-(aminocarbonyl)ethylamino)carbonylmethyl;(2-(aminomethyl)pyridin-3-yl)methyl;(2-(carboxy)ethylamino)carbonylmethyl;(2-(dimethylamino)ethylamino)carbonylmethyl;(2-(hydroxy)ethylamino)carbonylmethyl;(2-(methylamino)ethylamino)carbonylmethyl;(2-(N-methyl-N-(t-butoxycarbonyl)-amino)ethylamino)carbonylmethyl;(2-oxopiperidin-3-yl) methyl;(3-(dimethylamino)propylamino)carbonylmethyl;(3-(hydroxy)ethylamino)carbonylmethyl; (3-(t-butaxycarbonylamino)propylamino)carbonylmethyl: (4-(aminomethyl)pyridin-2-yl)methyl;(5-(aminomethyl)pyridin-2-yl)methyl;(6((1,3-dioxoisoindolin-2-yl)methyl)pyridin-2-yl) methyl;(6-(2-aminoethylamino)pyridin-2-yl)methyl;(6-(3-aminopropylamino)pyridin-2-yl) methyl;(6-(aminomethyl)pyridin-2-yl)methyl;(6-(hydroxymethyl)pyridin-2-yl)methyl; (6-bromopyridin-2-yl)methyl;(methylsulfonamido)carbonylmethyl; (pyridin-2-yl) ethylamino;1-(2-(tert-butoxycarbonylamino)ethyl)-1H-pyrazol-3-ylmethyl;1-(2-(tert-butoxycarbonylamino) ethyl)-1H-pyrazol-5-ylmethyl;1-(aminocarbonyl)-2-(amino)-eth-1-yl;1-(aminocarbonyl)-3-(amino)-propyl; 1-(aminocarbonyl)-4-(amino)-butyl;1-(aminocarbonyl)-4-(benzyloxycarbonylamino)-pentyl;1-(aminocarbonyl)-5-(amino)-pentyl; 1-(aminocarbonyl)eth-1-yl;1-(carboxy)-2-(amino)-eth-1-yl;1-(dimethylaminocarbonyl)-2-(amino)-eth-1-yl;1-(hydroxy)-2-(aminocarbonylmethylamino)eth-1-yl;1-(hydroxy)-2-(ethoxycarbonylmethylamino)eth-1-yl;1-(hydroxy)-2-(pyridin-2-ylmethylamino)eth-1-yl;1-(methoxycarbonyl)-2-(amino)-eth-1-yl;1-(methoxycarbonyl)-2-(t-butoxycarbonylamino)-eth-1-yl;1-(methoxycarbonyl)eth-1-yl; 1-(methylaminocarbonyl)-2-(amino)-eth-1-yl(2 occ); 1-(methylaminocarbonyl)eth-1-yl;1-aminocarbonyl-2-hydroxy-eth-1-yl;1-methoxycarbonyl-2-hydroxy-eth-1-yl; 2-(2-aminoethoxy) ethyl;2-(2-aminoethyl)-pyridin-6-ylmethyl; 2-(2-aminoethylamino)ethyl;2-(3-fluorophenyl)ethyl; 2-(3-methoxycarbonyl)ethyl;2-(6-(aminomethyl)pyridin-2-yl)ethyl; 2-(acetylamino)ethyl;2-(amino)ethyl; 2-(aminocarbonyl)-2-(acetylamino)-eth-1-yl;2-(aminocarbonyl)-2-(amino)-eth-1-yl; 2-(aminocarbonyl)ethyl;2-(aminomethyl)pyridin-5-ylmethyl; 2-(carboxy)-2-(amino)-eth-1-yl;2-(dimethylamino)ethyl; 2-(dimethylaminocarbonyl)-2-(amino)-eth-1-yl;2-(ethoxycarbonyl)ethyl; 2-(methoxycarbonyl)-2-(acetylamino)-eth-1-yl;2-(methoxycarbonyl)-2-(amino)-eth-1-yl; 2-(methoxycarbonylamino)ethyl;2-(methylamino)ethyl; 2-(methylaminocarbonyl)-2-(acetylamino)-eth-1-yl;2-(methylaminocarbonyl)-2-(amino)eth-1-yl; 2-(methylsulfonamido)ethyl;2-(methyoxycarbonyl)-2-(amino)eth-1-yl; 2-(N-(t-butoxycarbonyl)-N-(methyl)-amino)ethyl; 2-(piperazin-1-yl)ethyl; 2-(pyrazin-2-yl)ethyl;2-(pyridin-2-yl)ethyl; 2-(pyridin-3-yl)ethyl;2-(t-butoxycarbonylaminomethyl)pyridin-3-ylmethyl;2-(t-butoxycarbonylaminomethyl)pyridin-6-ylmethyl;2-(trifluoromethyl)-pyridin-6-ylmethyl; 2-aminopyridin-3-ylmethyl;2-aminopyridin-5-ylmethyl; 2-chloropyridin-5-ylmethyl;2-cyanopyridin-5-ylmethyl; 2-hydroxy-3-amino-prop-1-yl; 2-hydroxyethyl;2-methoxyeth -1-yl; 2-methoxypyridin-3-ylmethyl;2-methoxypyridin-5-ylmethyl: 2-methylpyridin -3-ylmethyl;2-methylpyridin-5-ylmethyl; 2-methylpyridin-6-ylmethyl; 3-(2-aminoethyl)cyclohexyl)methyl; 3-(4-methylpiperazin-1-yl)propyl;3-(amino)-3-(methylaminocarbonyl)prop-1-yl; 3-(aminocarbonyl)propyl;3-(aminomethyl)benzyl; 3-(aminomethyl)pyridin-2-ylmethyl;3-(methoxycarbonyl)propyl; 3-(methylaminocarbonyl)propyl;3-(trifluoromethyl)-pyridin-2-ylmethyl; 3,4-difluorobenzyl;3-aminomethylpyridin-4-ylmethyl; 3-aminopropyl; 3-carbamoylcyclopentyl;3-carboxypropyl; 3-hydroxypropyl; 3-methoxypropyl;4-(aminomethyl)-pyridin-2-ylmethyl;4-(N,N-dimethylamino)pyridin-3-ylmethyl;4-(t-butoxycarbonylamino)-morpholinomethyl; 4-aminobutyl;4-aminomethylpyridin-3-ylmethyl; 4-cyanobenzyl; 4-fluorobenzyl;4-methylaminopyridin -3-ylmethyl; 4-methylbenzyl;4-morpholinopyridin-3-ylmethyl; 4-piperazinylpyridin -3-ylmethyl;5-((bis(dimethylamino)methylamino)methyl)pyridin-3-ylmethyl;5-(aminomethyl)pyridin-2-ylmethyl; 5-(aminomethyl)pyridin-3-ylmethyl;5-(hydroxymethyl)pyridin-3-ylmethyl;5-(t-butoxycarbonylaminomethyl)-pyridin-2-ylmethyl;5-(trifluoromethyl)-pyridin-2-ylmethyl; 5-aminopentyl;5-aminopyridin-2-ylmethyl;6-((bis(dimethylamino)methyleneamino)methyl)pyridin-2-yl)methyl;6-(4-acetylpiperazin-1-yl) pyridin-3-ylmethyl);6-(aminomethyl)pyridin-2-yl)methyl; 6-aminohexyl; aminocarbonylmethyl;benzyl; cyclopropylmethyl; dimethylaminocarbonylmethyl; isopropyl;isoxazol-5-ylmethyl; methoxycarbonylmethyl; methyl;methylaminocarbonylmethyl; oxazol-2-ylmethyl; piperidin-4-ylmethyl;prop-2-en-1-yl; pyrazin-2-ylmethyl; pyridin-2-ylmethyl;pyridin-2-ylmethyl -N-oxide; pyridin-3-ylmethyl; pyridin-3-ylmethyl-N-oxide; pyridin-4-ylmethyl; thiophen-2-ylmethyl; andthiophen-3-ylmethyl.
 11. The compound of claim 1 wherein Z³ isoptionally substituted lower alkyl.
 12. The compound of claim 11 whereinZ³ is chosen from optionally substituted methyl, optionally substitutedethyl, and optionally substituted propyl wherein the methyl, ethyl andpropyl groups are optionally substituted with one or two groups selectedfrom hydroxy, optionally substituted aryl, optionally substitutedheteroaryl, optionally substituted heterocycloalkyl, optionallysubstituted cycloalkyl, and optionally substituted aryloxy.
 13. Thecompound of claim 12 wherein Z³ is chosen from 2-(3-methylphenyl)ethyl,(tetrahydrofuran-2-yl)methyl, 1-hydroxycyclohexylmethyl,2-(1,3-dioxolan-2-yl)ethyl, 2-(1H-imidazol-4--yl)ethyl, 2-(1--methyl-1H-imidazol-4--yl)ethyl, 2-(1-methylpiperidin-4-yl)ethyl,2-(2,3-difluorophenyl) ethyl, 2-(2,5-difluorophenyl)ethyl,2-(2,6-difluorophenyl)ethyl, 2-(2-chlorophenyl) ethyl,2-(2-cyanophenyl)ethyl, 2-(2-fluorophenyl)ethyl, 2-(2-hydroxyphenyl)ethyl, 2-(2-methoxyphenyl)ethyl, 2-(2-methylphenyl)ethyl,2-(2-oxoimidazolidin -1-yl)ethyl, 2-(2-oxopiperidin-1-yl)ethyl,2-(2-oxopyrrolidin-1-yl)ethyl, 2-(3-(trifluoromethyl)phenyl)ethyl,2-(3,4-difluorophenyl)ethyl, 2-(3,5-difluorophenyl)ethyl,2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyl,2-(3,5-dimethyl-1H-pyrazol-4-yl)ethyl, 2-(3-carbamoylphenyl)ethyl,2-(3-carboxyphenyl)ethyl, 2-(3-cyanophenyl)ethyl, 2-(3-fluorophenyl)-2-(hydroxy)-ethyl, 2-(3-fluorophenyl)ethyl,2-(3-fluoropyridin-2-yl)ethyl, 2-(3-methoxycarbonylphenyl)ethyl,2-(3-methoxyphenyl)ethyl, 2-(3-methylphenyl)ethyl,2-(4-aminophenyl)ethyl, 2-(4-chlorophenyl)ethyl,2-(4-fluorophenyl)ethyl, 2-(4-hydroxyphenyl) ethyl,2-(benzo[d][1,3]dioxol-5--yl)ethyl, 2-(furan-2-yl)ethyl,2-(hydroxy)-2-(phenyl)ethyl, 2-(phenyl)ethyl, 2-(pyridin-2-yl)ethyl,2-(pyridin-3-yl)ethyl, 2-(thiophen-2-yl) ethyl, 2-cyclohex-1-enylethyl,2-cyclohexylethyl, 2-morpholinoethyl, 2-phenoxyethyl, 2-phenylprop-1-yl,3-(1H-imidazol-1-yl)prop-1-yl, 3-phenylpropyl, benzyl, chloro,isopentyl, propyl, pyridin-2-ylmethyl, pyridin-3-ylmethyl, andthiophen-3-ylmethyl.
 14. The compound of claim 1 wherein Z³ is chosenfrom 2-(3-fluorophenyl)ethyl and 2-(pyridin-2-yl)ethyl.
 15. The compoundof claim 1 wherein Z¹ is optionally substituted alkenyl.
 16. Thecompound of claim 1 wherein Z¹ is chosen from alkenyl, and alkyl,wherein each group is substituted by one or two groups selected fromcyano, halo, hydroxy, formyl, optionally substituted alkyl, optionallysubstituted alkenyl, optionally substituted alkoxy, carboxyl, optionallysubstituted alkoxycarbonyl, optionally substituted acyl, optionallysubstituted aminocarbonyl, optionally substituted heterocycloalkyl,optionally substituted heteroaryl, optionally substituted carbamimidoyl,and optionally substituted sulfonyl.
 17. The compound of claim 1 whereinZ¹ is chosen from (Z)-but-2-en-2-yl; 1 ethoxyvinyl; 2 methylprop-1-enyl;3-(methoxycarbonyl)-prop-2-en-2-yl; 3 methoxy-prop-1-enyl; 3methylbut-2-en-2-yl; and prop-1-enyl.
 18. The compound of claim 1wherein R¹ is chosen from hydrogen and methyl.
 19. The compound of claim18 wherein R¹ is hydrogen.
 20. The compound of claim 1 wherein thecompound of Formula I is chosen from(6-((1Z)-1-methylprop-1-enyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide(6-((1E)prop-1-enyl)-5-bromo-2-{[2-(3-fluoropheny)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide, methyl(2E)-3-(6-{[2-(3--fluoropheny)ethyl]amino}-5[N-(3-pyridylmethyl)carbamoyl](2-pyridyl))but-2-enoate,(6-((1E)prop-1-enyl)-2-{[2-(3--fluoropheny)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide,(6-((1E)prop-1-enyl)-2-{[2-(3--fluorophenyl)ethyl]amino}(3-pyridyl))-N-3-pyridylmethyl)carboxamide,(2-{[2-(3-fluorophenyl)ethyl]amino}6-(2methylprop-1-enyl)(3-pyridyl))-N-(3(pyridylmethyl)carboxamide,(6-((1E)prop-1-enyl)-2-{[2-(3--fluorophenyl)ethyl]amino}(3-pyridyl))-N-{[2-(aminomethyl)(3-pyridyl)]methyl}carboxamide,(6-((1E)-3-methoxyprop-1-enyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide,(6-(ethoxyethyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide,(6-((1E)prop-1-enyl)-5-fluoro-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-{[2-(aminomethyl)(3-pyridyl)]methyl}carboxamide,(6-((1E)prop-1-enyl)-5-fluoro-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-[(2-{[(tert-butoxy)carbonylamino]methyl}(3-pyridyl))methyl]carboxamide,(6-(1,2-dimethylprop-1-enyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide,(2-{[2-(3--fluorophenyl)ethyl]amino}-6-(3-methoxypropyl)(3-pyridyl))-N-(3-pyridylmethyl)carboxamide,and(6-(1-ethoxyvinyl)-2-{[2-(3-fluorophenyl)ethyl]amino}(3-pyridyl))-N-(3-pyridylmethyl)carboxamide,or a pharmaceutically acceptable salt thereof.
 21. The compound of claim1, wherein R² is optionally substituted pyridylmethyl.
 22. The compoundof claim 21, wherein R² is optionally substituted 3-pyridylmethyl. 23.The compound of claim 22, wherein R² is chosen from 3-pyridylmethyl,[2-(aminomethyl)(3-pyridyl)]methyl, and(2-{[(tert-butoxy)carbonylamino]methyl}(3-pyridyl))methyl.
 24. Thecompound of claim 1, wherein Z¹ is alkyl substituted with one or twogroups chosen from hydroxyl and optionally substituted alkoxy.
 25. Thecompound of claim 24, wherein Z¹ is chosen from 1-ethoxyeth-1-yl and3-methoxypropyl.
 26. The compound of claim 1, wherein Z³ is methyl orethyl substituted with a group chosen from optionally substituted aryland optionally substituted heteroaryl.
 27. The compound of claim 26,wherein Z³ is methyl or ethyl substituted with a group chosen fromoptionally substituted phenyl and optionally substituted pyridyl. 28.The compound of claim 27, wherein Z³ is ethyl substituted with a groupchosen from optionally substituted phenyl and optionally substitutedpyridyl.
 29. The compound of claim 1 wherein R¹ is hydrogen; R² isoptionally substituted pyridylmethyl; Z¹ is optionally substitutedalkenyl; and Z³ is methyl or ethyl substituted with a group chosen fromoptionally substituted aryl and optionally substituted heteroaryl. 30.The compound of claim 29, wherein Z³ is ethyl substituted with a groupchosen from optionally substituted phenyl and optionally substitutedpyridyl.
 31. The compound of claim 30, wherein R⁴ is hydrogen.
 32. Apharmaceutically acceptable composition comprising a pharmaceuticallyacceptable carrier and a compound of claim 1 or a pharmaceuticallyacceptable salt thereof.
 33. The pharmaceutical composition of claim 32wherein the composition is formulated in a form chosen from a tablet,capsule, powder, liquid, suspension, suppository and aerosol.
 34. Apackaged pharmaceutical composition comprising a pharmaceuticalcomposition of claim 32 and instructions for using the composition totreat a patient suffering from a disease associated with smooth musclemyosin or non-muscle myosin.
 35. The packaged pharmaceutical compositionof claim 34 wherein the disease associated with smooth muscle myosin isselected from hypertension, asthma, chronic obstructive pulmonarydisease (copd) asthma, bronchoconstrictive disease, glaucoma and otherocular indications, incontinence and other bladder dysfunctions,irritable bowel syndrome, pre-term labor, esophageal dysmotility,strokes, subarachnoid hemorrhages, pre-menstrual cramps, erectiledysfunction and other acute and chronic diseases and conditionsassociated with smooth muscle myosin and/or non-muscle myosin.
 36. Amethod of treating a disease associated with smooth muscle myosin ornon-muscle myosin in a mammal which method comprises administering to amammal in need thereof a therapeutically effective amount of a compoundof claim 1 or a pharmaceutically acceptable salt thereof wherein saiddisease associated with smooth muscle myosin is selected fromhypertension, asthma, chronic obstructive pulmonary disease (copd)asthma, bronchoconstrictive disease, glaucoma and other ocularindications, incontinence and other bladder dysfunctions, irritablebowel syndrome, pre-term labor, esophageal dysmotility, strokes,subarachnoid hemorrhages, pre-menstrual cramps, and erectiledysfunction.